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  • Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences  (35)
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  • Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences  (35)
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  • 1
    Online Resource
    Online Resource
    Simulation analysis of dynamic response of the energy harvester based on diamagnetic levitation
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2018
    In:  Acta Physica Sinica Vol. 67, No. 1 ( 2018), p. 018501-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 67, No. 1 ( 2018), p. 018501-
    Abstract: Based on diamagnetic levitation, the micro-vibration energy harvester is proposed, which has advantages such as low friction, low mechanical damping, low-frequency response and free of maintenance. The floating magnet is one of the most important parts in the vibration energy harvester. The dynamic properties of the floating magnet directly determine the output characteristics of the energy harvester. In order to study the vibration properties of the floating magnet, the force characteristics of the floating magnet are investigated in the vibration energy harvester. The magnetic and diamagnetic forces exerted on the floating magnet are simulated using finite element analysis software COMSOL Multiphysics. Then the dynamic characteristics of the floating magnet are further analyzed by MATLAB. In the case of the present study, when the gap between the two pyrolytic graphite plates is smaller than 7.7 mm, the floating magnet works in a monostable state. At the same time the floating magnet runs in a bistable state when the gap between the two pyrolytic graphite plates is larger than 7.7 mm. The two working states are in accordance with the experimental results. The results prove that the theoretical analysis and experimental results are in good agreement. Furthermore, the dynamic response of the energy harvester is studied in the two working states. When the coils are open-circuited and the energy harvester is in a monostable state, it is found that the dynamic response can be equivalent to that of a linear system with a nonlinear disturbance. So, the amplitude-frequency curve is right-skewed. We also analyze the influence of the gap between the two pyrolytic graphite plates on the amplitude-frequency curve. It is found that with the increase of the gap between the two pyrolytic graphite plates, the nonlinear disturbance becomes stronger, leading to a stronger right-skewed phenomenon in the amplitude-frequency curve. When the coils are open-circuited and the energy harvester is in a bistabtle state, the dynamic response is very complex, which includes double period, 4-time period and chaos. It is because the change of the amplitude of external excitation affects relative strength between the linear and nonlinear parts in the energy harvester system, resulting in the change of vibration characteristic of the floating magnet. When the coils are linked to load and the energy harvester is in a bistabtle state, the frequency of the energy harvester is consistent with that of the external excitation. This study can serve as a reference for designing the structure of the vibration energy harvester with using diamagnetic levitation. And it provides a theoretical guidance for improving the performance of the energy harvester and expanding the working bandwidth of the harvester. The energy harvester has vast application potential in wireless sensor networks and portable electronic devices.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.67.20171551
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2018
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  • 2
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    Online Resource
    Synthesis, structure and spectroscopic properties of Nd3+:SrY2O4 phosphor
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2016
    In:  Acta Physica Sinica Vol. 65, No. 1 ( 2016), p. 014211-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 65, No. 1 ( 2016), p. 014211-
    Abstract: In order to obtain new-type laser crystals, SrY2O4 is chosen as a host material. Because Y3+ ions in SrY2O4 occupy two non-equivalent sites, it might be possible to realize dual-wave laser and broadband emission at 1.06 m by partially replacing Y3+ with Nd3+. In this work, (3 at.%) Nd3+ doped SrY2O4 phosphor is synthesized by the conventional solid state reaction. The structure and luminescence properties in the visible and near-infrared ranges are studied. The peaks in the X-ray powder diffraction pattern of (3 at.%) Nd3+:SrY2O4 can be well indexed according to ICSD#25701. The lattice parameters, atomic coordinates, atomic temperature factors etc., are obtained by the Rietveld refinement with R_p of 4.68% and R_wp of 5.91%. According to the excitation spectra in a range of 220-380 nm, it can be seen that Nd3+:SrY2O4 is efficiently excited by 353 nm which is assigned to the 4I9/24D3/2+4D5/2+2I11/2+4D1/2 transition of Nd3+ ions. Under the 353 nm light excitation, Nd3+:SrY2O4 exhibits the strongest emission at 419 nm corresponding to the 2D15/24I9/2 transition of Nd3+ ions. What is more, Nd3+:SrY2O4 can be excited effectively by 824 nm light, which matches well with the commercial 830 nm diode laser. When excited with 824 nm, the strongest fluorescence peak is located at 1083 nm with a wide bandwidth of about 90 nm. Compared with that at 8~K, the bandwidth in the fluorescence spectrum at 300 K is broadened because of the homogeneous broadening induced by the increase of temperature. Additionally, the peaks corresponding to the 4F3/24I11/2 transition are split into two groups at 8~K, which results from the two non-equivalent sites of Nd3+ ions. Compared with Nd3+:YAG, Nd3+:SrY2O4 has more potential applications in the tunable and ultrashort lasers. The fluorescence lifetime of the 4F3/24I11/2 transition of (3 at.%) Nd3+:SrY2O4 is 281.7 s, which shows slight concentration quenching compared with that of (0.5 at.%) Nd3+:SrY2O4. The fluorescence lifetime of (3 at.%) Nd3+:SrY2O4 is much longer than that of (0.6 at.%) Nd3+:YAG which is beneficial to the energy storage. In conclusion, the wide emission band and the long decay time of 1.08 m indicate that Nd3+:SrY2O4 is a very promising new-wavelength and ultrashort laser material pumped by laser diode.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.65.014211
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2016
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  • 3
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    Online Resource
    Measurement of refractive indices of GdTaO4 crystal by the auto-collimation method
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2016
    In:  Acta Physica Sinica Vol. 65, No. 8 ( 2016), p. 087801-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 65, No. 8 ( 2016), p. 087801-
    Abstract: In this paper, the refractive index of GdTaO4 crystal is measured by the auto-collimation method. GdTaO4 crystal is processed into three rectangular prisms, their planes with longer right angle side are planes a, b and c of the crystal, respectively, and their normal directions are the directions of crystal plane axes a, b and c, respectively. with a side by angle . Plane enclosed by hypotenuse and the longer right angle side is subjected to fine polishing, while the surface plating for the latter is subjected to Al reflectance coating, so that the light is incident along the hypotenuse plane with minimum angle of deviation (), reflects on the plane with longer right angle and returns along the original path. The rectangular prisms processed by GdTaO4 crystal are placed on the platform of 32 J goniometer with an accuracy of arc seconds. The 473, 532 nm YAG double frequency laser, 633 nm He-Ne laser and 1064 nm YAG laser with stable light intensity are used as a measuring light source, light will refract into the light perpendicular to the longer right angle side when the laser of measuring light source shoots towards the bevel of a prism with a minimum angle of deviation (). The refractive indexes nx, ny, and nz of a crystallographic axis directions can be measured by , and the relationship between refractive index ellipsoid section and prism refraction of light. The constants Ai, Bi, Ci, and Di (i=x, y, z) are given in Sellmeier's equation ni2 =Ai+Bi/(2-Ci)-Di2, and the values of angle Vz included between light axis and refractive index at wavelengths of 473, 532, 632.8 and 1064 nm are calculated to be 22.5, 22.5, 21.9 and 22.0, respectively. It is proved that GdTaO4 crystal is optically positive biaxial crystal.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.65.087801
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2016
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  • 4
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    Online Resource
    Spectral and laser properties of Nd:YSAG single crystal
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2017
    In:  Acta Physica Sinica Vol. 66, No. 15 ( 2017), p. 154204-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 66, No. 15 ( 2017), p. 154204-
    Abstract: In order to solve the problem of low segregation coefficient of Nd3+ ions in YAG crystal, Sc3+ ions are used to replace some Al3+ ions in YAG, so that the YAG cell becomes bigger, thereby the segregation coefficient of Nd3+ ion increases. In this paper, the spectra and laser characteristics of Nd:YSAG single crystal are studied. The (1.5 at.%) Nd3+:Y3Sc2Al3O12 (YSAG) laser crystal is grown by Czochralski method, and X-ray rocking curve shows that the crystal quality is good. The concentration of ions in Nd:YSAG is measured by an electronic probe. The segregation coefficient of Nd3+ ion is calculated to be 0.35, which is approximately twice as much as that of Nd3+ in YAG. The absorption and emission spectra are measured, which indicates that it can be pumped by an 808 nm-laser diode (LD). The strongest emission from the transition 4F3/24I11/2 of Nd:YSAG peaks at 1059 nm with an emission cross section of 1.0310-19 cm2, and the lifetime of 4F3/2 is about 253 s, which indicates that Nd:YSAG has roughly an efficiency equal to that of Nd:YAG, but the laser upper level lifetime is longer than that of Nd:YAG, which is more favorable for Q-switched laser operation. The 808 nm-LD is used to pump Nd:YSAG rod of 2 mm2 mm6 mm, the laser operation with a threshold of 0.85 W and a maximum output power of 1.1 W is realized:the laser slope efficiency is 21.1%, and the optical conversion efficiency is 18.3%. All of the above results show that Nd:YSAG single crystal is a good solid state laser material, which is more favorable for Q-switched laser operation.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.66.154204
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2017
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  • 5
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    Online Resource
    Up-conversion luminescence in Er3+/Yb3+-codoped Gd3Sc2Ga3O12 laser crystals
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2008
    In:  Acta Physica Sinica Vol. 57, No. 12 ( 2008), p. 7712-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 57, No. 12 ( 2008), p. 7712-
    Abstract: Er3+/Yb3+:Gd3Sc2Ga3O12 and Er3+:Gd3Sc2Ga3O12 crystals have been grown by Czochralski method. The absorption spectra from 320 to 1700nm and the up-conversion fluorescence spectra from 500 to 750nm of them were investigated at room temperature, respectively. The possible up-conversion luminescence mechanisms in Er3+/Yb3+-codoped crystals and their influences on the 2.8μm laser emission were discussed. Experimental results show that the absorption of Er3+:Gd3Sc2Ga3O12 around 966nm and its bandwidth are remarkably increased by Yb3+ sensitizing. Under 940nm excitation, the up-conversion luminescence intensity of Er3+/Yb3+:Gd3Sc2Ga3O12 is much stronger than that of Er3+:Gd3Sc2Ga3O12. It demonstrates that there exist effective energy transfer processes between Yb3+ and Er3+, and the dominant mechanism of up-conversion may be the energy transfer processes of Yb3+-Er3+ and Er3+-Er3+.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.57.7712
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2008
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  • 6
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    Online Resource
    Absorption spectra and crystal-field modeling of Er3+ doped in Y3Sc2Ga3O12 crystal
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2014
    In:  Acta Physica Sinica Vol. 63, No. 14 ( 2014), p. 144205-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 63, No. 14 ( 2014), p. 144205-
    Abstract: Er3+-doped Y3Sc2Ga3O12 (Er:YSGG) single crystal is grown by Czochralski method successfully, and the absorption spectra are measured in a wider spectral wavelength range (340-1700 nm). The experimental energy levels are analyzed and identified. The free-ion and crystal-field parameters are fitted by the experimental energy levels with a root mean square deviation of 10.34 cm-1, and 102 Stark energy levels of Er3+ in YSGG host crystals are assigned. It indicates that the fitting results of Stark energy levels are more satisfactory with the experimental spectra. Finally, the fitting results of free-ion and crystal-field parameters are compared with those already reported of Er:YAG crystal. A conclusion is drawn that the Er:YSGG has higher laser efficiency than Er:YAG, which may result from Er:YSGG that has a strong crystal field interaction.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.63.144205
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2014
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  • 7
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    Online Resource
    Growth and spectral properties of 5 at%Yb:YNbO4 crystal
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2012
    In:  Acta Physica Sinica Vol. 61, No. 22 ( 2012), p. 228103-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 61, No. 22 ( 2012), p. 228103-
    Abstract: 5 at%Yb3+:YNbO4 crystal is grown by Czochralski(CZ) method. Its transmission and emission spectra are measured. The absorption peaks are located at 933, 955, 974 and 1003 nm with their corresponding absorbtion cross section values 0.7310-20, 1.8510-20, 0.8610-20 and 0.4410-20 cm2; and the FWHM of 955 nm absorbtion peak is 17 nm. Its emission band centered at 1020 nm with the FWHM is 41 nm, which is over three times that of Yb3+:YAG crystal. The emission cross section values of 955, 974, 1005, 1021 and 1030 nm peaks are calculated to be 0.6910-20, 0.8610-20, 1.8110-20, 1.1110-20 and 0.5710-20 cm2, respectively, and the biggest one is comparable to that of Yb3+:YAG crystal. The laser parameters of 5 at% Yb3+:YNbO4 crystal are evaluated and the results suggest that it is a potential all-solid-state pumped laser crystal in tunable and ultrafast lasers field.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.61.228103
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2012
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  • 8
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    Online Resource
    Growth and characterization of Ti:MgAl〈sub〉2〈/sub〉O〈sub〉4〈/sub〉 laser crystal by Czochralski method
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2020
    In:  Acta Physica Sinica Vol. 69, No. 1 ( 2020), p. 014210-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 69, No. 1 ( 2020), p. 014210-
    Abstract: The melting point of Ti:MgAl〈sub〉2〈/sub〉O〈sub〉4〈/sub〉 crystal is as high as 2130 °C, it is a challenge to obtain a large-sized and high-quality laser crystal. By optimizing the crystal growth process, Ti:MgAl〈sub〉2〈/sub〉O〈sub〉4〈/sub〉 crystal with a size of 30 mm× 70 mm is successfully grown by the Czochralski method under the condition of weak reducing atmosphere. The X-ray diffraction pattern is studied, and the x-ray rocking curve indicates that the grown crystal has a high crystalline quality in terms of the lower full width at half maximum(FWHM) intensity, which provides a material basis for the next laser output experiment. In a range of 100–1000 cm〈sup〉–1〈/sup〉, there are four Raman vibration peaks located at 312, 410, 675 cm〈sup〉–1〈/sup〉 and 771 cm〈sup〉–1〈/sup〉 respectively. The grown crystal has an absorption cutoff range of 250–318 nm and two wide absorption bands of 395–495 nm and 550–1100 nm. Excited by 271 nm, the grown crystal shows a strong broadband emission ina range of 340–650 nm with a peak centered at 480 nm. After annealing in hydrogen atmosphere, shape of the transmittance spectrum and emission spectrum are both unchanged, but the fluorescent emission intensity is significantly reduced. After annealing in air atmosphere, the original two absorption bands disappear while none of the characteristics of fluorescence emission in a 340–650 nm range changes significantly. In addition, a new fluorescence emission peak near 725 nm is observed. Combining with the ESR spectrum, what we canconfirm is that the Ti:MgAl〈sub〉2〈/sub〉O〈sub〉4〈/sub〉 as-grown crystal contains Ti〈sup〉3+〈/sup〉 and Ti〈sup〉4+〈/sup〉 ions, and no ESR signal of Ti〈sup〉3+〈/sup〉 is observed after annealing in air atmosphere. Moreover, excitationspectrum is also recorded. The fluorescence lifetime is 14 μs at room temperature, which is 4–5 times that of Ti:Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 crystal and Ti:BeAl〈sub〉2〈/sub〉O〈sub〉4〈/sub〉 crystal. Furthermore, the emission cross section of the grown Ti:MgAl〈sub〉2〈/sub〉O〈sub〉4〈/sub〉 crystal is calculated from the Füchtbauer-Ladenburg (F-L) formula and its value is 2 × 10〈sup〉–20〈/sup〉 cm〈sup〉2〈/sup〉, large emission cross section which is beneficial for realizing laser oscillation. All the above results show that the Ti:MgAl〈sub〉2〈/sub〉O〈sub〉4〈/sub〉 crystal is a potential crystal material for realizing broadband tunable blue laser output.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.69.20191150
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2020
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  • 9
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    Growth and spectral properties of Pr, Yb, Ho:GdScO〈sub〉3〈/sub〉 crystal
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2024
    In:  Acta Physica Sinica Vol. 73, No. 5 ( 2024), p. 059801-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 73, No. 5 ( 2024), p. 059801-
    Abstract: In order to explore and develop new crystal materials in the 2.7–3.0 μm band, Pr, Yb, Ho:GdScO 〈 sub 〉 3 〈 /sub 〉 crystal are successfully grown by the Czochralski method for the first time. X-ray diffraction measurement is performed to obtain powder diffraction data. Raman spectra aree measured and the vibration peaks are identified. The transmission spectrum, emission spectrum and fluorescence lifetime of Pr, Yb, Ho:GdScO 〈 sub 〉 3 〈 /sub 〉 crystal are also characterized. The center of the strongest absorption band is at 966 nm with a half-peak width of 90 nm, which comes from the transition of Yb 〈 sup 〉 3+ 〈 /sup 〉 : 〈 sup 〉 2 〈 /sup 〉 F 〈 sub 〉 7/2 〈 /sub 〉 → 〈 sup 〉 2 〈 /sup 〉 F 〈 sub 〉 5/2 〈 /sub 〉 . The absorption cross section of Yb 〈 sup 〉 3+ 〈 /sup 〉 is calculated and the values at 966, 973, 985 nm are 0.62×10 〈 sup 〉 –20 〈 /sup 〉 , 0.60×10 〈 sup 〉 –20 〈 /sup 〉 and 0.58×10 〈 sup 〉 –20 〈 /sup 〉 cm 〈 sup 〉 2 〈 /sup 〉 respectively. The maximum emission peak is at 2850 nm and the half-peak width is 70 nm, the lifetimes of Ho 〈 sup 〉 3+ 〈 /sup 〉 : 〈 sup 〉 5 〈 /sup 〉 I 〈 sub 〉 6 〈 /sub 〉 and 〈 sup 〉 5 〈 /sup 〉 I 〈 sub 〉 7 〈 /sub 〉 are measured to be 1094 and 56 μs respectively, and the emission cross section at 2850 and 2935 nm are calculated to be 3.6×10 〈 sup 〉 –20 〈 /sup 〉 cm 〈 sup 〉 2 〈 /sup 〉 and 1.21×10 〈 sup 〉 –20 〈 /sup 〉 cm 〈 sup 〉 2 〈 /sup 〉 , respectively. Comparing with Yb, Ho: GdScO 〈 sub 〉 3 〈 /sub 〉 crystal, the absorption peak of Yb 〈 sup 〉 3+ 〈 /sup 〉 and the emission peak are both broadened, which are related to the increase of crystal disorder. The lifetime of the lower energy level decreases significantly. Furthermore, the energy transfer mechanism between 〈 inline-formula 〉 〈 tex-math id="Z-20240305181828" 〉 \begin{document}$\rm Ho^{3+} $\end{document} 〈 /tex-math 〉 〈 alternatives 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="5-20231362_Z-20240305181828.jpg"/ 〉 〈 graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="5-20231362_Z-20240305181828.png"/ 〉 〈 /alternatives 〉 〈 /inline-formula 〉 and Pr 〈 sup 〉 3+ 〈 /sup 〉 is analyzed, and the energy transfer efficiency between Ho 〈 sup 〉 3+ 〈 /sup 〉 : 〈 sup 〉 5 〈 /sup 〉 I 〈 sub 〉 7 〈 /sub 〉 and Pr 〈 sup 〉 3+ 〈 /sup 〉 : 〈 sup 〉 3 〈 /sup 〉 F 〈 sub 〉 2 〈 /sub 〉 + 〈 sup 〉 3 〈 /sup 〉 H 〈 sub 〉 6 〈 /sub 〉 is calculated to be 99%, which is higher than those in other materials. All the results show that Pr, Yb, Ho:GdScO 〈 sub 〉 3 〈 /sub 〉 crystal is an excellent 2.7–3 μm laser material, and is easier to achieve laser output than Yb, Ho:GdScO 〈 sub 〉 3 〈 /sub 〉 crystal.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Article
    DOI: 10.7498/aps.73.20231362
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2024
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  • 10
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    Negative refraction and bulk polariton properties of the graphene-based hyperbolic metamaterials
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2015
    In:  Acta Physica Sinica Vol. 64, No. 6 ( 2015), p. 067301-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 6 ( 2015), p. 067301-
    Abstract: We theoretically investigate the electromagnetic properties of the multilayer graphene-dielectric composite materials based on the effective medium theory. It is found that the structure exhibits hyperbolic isofrequency wavevector dispersions at THz and far-infrared frequencies, hence thereby realizing the effective graphene-based hyperbolic metamaterials (HMM). The frequncy band of the hyperbolic dispersion can be tuned by changing the Fermi energy of graphene sheet, the thickness of the dielectric layer and the layer number of graphene sheets. Because of the hyperbolic dispersion, graphene-based HMM possesses a negative energy refraction and positive phase refraction for oblique incidence at far below the critical frequency. The highly confined bulk polariton modes are also supported. Based on the attenuated total reflection configuration, the excitation of the bulk polariton mode is studied, in addition, such properties used in the tunable optical reflection modulation are also explored.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.64.067301
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2015
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