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  • Optica Publishing Group  (15)
  • Liu, Feng  (15)
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  • Optica Publishing Group  (15)
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  • 1
    Online Resource
    Online Resource
    Quasi-bound states in the continuum in metal complementary periodic cross-shaped resonators at terahertz frequencies
    Optica Publishing Group ; 2021
    In:  Optics Letters Vol. 46, No. 17 ( 2021-09-01), p. 4370-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 46, No. 17 ( 2021-09-01), p. 4370-
    Abstract: We numerically and experimentally demonstrate quasi-bound states in the continuum (BICs) in free-standing metal complementary periodic cross-shaped resonators (CPCRs) at terahertz frequencies. Such induced quasi-BICs arise from the broken symmetry in CPCRs. By slightly breaking mirror symmetry through reducing the length of one arm in CPCRs, the measured Q -factor of the quasi-BIC can reach 102, which is significantly high compared with that of conventional modes. Further study shows that the high Q -factor of the quasi-BIC is mainly determined not by the radiative loss but the material loss, as the asymmetry of the structures is unremarkable. The sharp quasi-BICs realized in the proposed structure may immediately boost the exploration of ultra-narrowband filters and ultra-sensitive sensors at terahertz frequencies.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.422771
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 243290-0
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  • 2
    Online Resource
    Online Resource
    Tunable 3D Dirac-semimetals supported mid-IR hybrid plasmonic waveguides
    Optica Publishing Group ; 2021
    In:  Optics Letters Vol. 46, No. 3 ( 2021-02-01), p. 472-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 46, No. 3 ( 2021-02-01), p. 472-
    Abstract: Based on 3D Dirac-semimetal (DSM) modified hybrid waveguides, tunable propagation properties have been investigated, including the effects of Fermi levels, structural parameters, and operation frequency. The results show that if the operation frequency is smaller (larger) than the transition frequency ( ℏ ω ≈ 2 | μ c | ), the proposed hybrid waveguides indicate strong (weak) confinement because the DSM layer manifests a high plasmonic (dielectric low) loss property. The dielectric fiber shape affects the propagation property obviously, as the elliptical parameter decreases, the confinement and figure of merit increase, and the loss reduces. With the increase in Fermi level, the propagation constant increases, and the frequency (amplitude) modulation depth is 32.31% (12.93%) if the Fermi level changes in the range of 0.01–0.15 eV. The results are very helpful in understanding the tunable mechanisms of hybrid waveguides and designing novel plasmonic devices in the future, e.g., modulators, filters, lasers, and resonators.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.415187
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 243290-0
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  • 3
    Online Resource
    Online Resource
    Fault detection performance of a multi-mode transmission reflection analysis for a few-mode fiber link
    Optica Publishing Group ; 2022
    In:  Optics Letters Vol. 47, No. 1 ( 2022-01-01), p. 74-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 47, No. 1 ( 2022-01-01), p. 74-
    Abstract: We propose a novel monitoring technique based on multi-mode transmission reflection analysis for a long-reach few-mode fiber (FMF) based mode division multiplexing system. By launching unmodulated continuous-wave optical light modes into the corresponding spatial modes of the FMF, the transmitted and reflected or backscattered optical powers can be measured and quantitatively analyzed to accurately characterize and locate the fault. The influences of the capture fraction, attenuation coefficient, and Rayleigh backscattering coefficient are discussed, and simulation results show that the proposed method can realize the fault location of the FMF link. Moreover, considering the influence of mode crosstalk on localization accuracy, it is clear that using the monitoring combination modes LP 01 and LP 21 gives a high precision of 3.58 m.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.446849
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
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  • 4
    Online Resource
    Online Resource
    Investigation of strontium titanate spherical shell supported terahertz all-dielectric metamaterials
    Optica Publishing Group ; 2021
    In:  Journal of the Optical Society of America B Vol. 38, No. 11 ( 2021-11-01), p. 3466-
    Details
    In: Journal of the Optical Society of America B, Optica Publishing Group, Vol. 38, No. 11 ( 2021-11-01), p. 3466-
    Abstract: Based on the strontium titanate ( S r T i O 3 , STO) spherical shell all-dielectric metamaterials (ADMs) structure, the tunable propagation characteristics have been systematically studied, taking into account the effects of structural geometrical parameter, temperature, and graphene Fermi level. The results indicate that STO-based ADMs exhibit excellent thermally and electrically tunable performances, e.g., when the temperature rises from 77 to 400 K, the modulation depths (MDs) of resonant frequency and amplitude of the reflection dip reach 62% and 93%, and the absorption is tunable in the range of 0.7995–0.9017. Additionally, when the Fermi level of graphene changes from 0.1 to 1.0 eV, the amplitude MD of the reflection dip reaches 99.89%, and the absorption of the STO-based ADM increases from 0.8352 to 0.9953. These results provide a guide for understanding the resonant mechanism of STO-based ADMs and designing multifunctional terahertz devices.
    Type of Medium: Online Resource
    ISSN: 0740-3224 , 1520-8540
    URL: Article
    DOI: 10.1364/JOSAB.435225
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    3D Dirac semimetal supported thermal tunable terahertz hybrid plasmonic waveguides
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 11 ( 2023-05-22), p. 17201-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 11 ( 2023-05-22), p. 17201-
    Abstract: By depositing the trapezoidal dielectric stripe on top of the 3D Dirac semimetal (DSM) hybrid plasmonic waveguide, the thermal tunable propagation properties have been systematically investigated in the terahertz regime, taking into account the influences of the structure of the dielectric stripe, temperature and frequency. The results manifest that as the upper side width of the trapezoidal stripe increases, the propagation length and figure of merit (FOM) both decrease. The propagation properties of hybrid modes are closely associated with temperature, in that when the temperature changes in the scope of 3-600 K, the modulation depth of propagation length is more than 96%. Additionally, at the balance point of plasmonic and dielectric modes, the propagation length and FOM manifest strong peaks and indicate an obvious blue shift with the increase of temperature. Furthermore, the propagation properties can be improved significantly with a Si-SiO 2 hybrid dielectric stripe structure, e.g., on the condition that the Si layer width is 5 µm, the maximum value of the propagation length reaches more than 6.46 × 10 5  µm, which is tens of times larger than those pure SiO 2 (4.67 × 10 4  µm) and Si (1.15 × 10 4  µm) stripe. The results are very helpful for the design of novel plasmonic devices, such as cutting-edge modulator, lasers and filters.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.487256
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 1491859-6
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  • 6
    Online Resource
    Online Resource
    Investigation of graphene-supported tunable asymmetric terahertz metamaterials
    Optica Publishing Group ; 2018
    In:  Journal of the Optical Society of America B Vol. 35, No. 3 ( 2018-03-01), p. 575-
    Details
    In: Journal of the Optical Society of America B, Optica Publishing Group, Vol. 35, No. 3 ( 2018-03-01), p. 575-
    Type of Medium: Online Resource
    ISSN: 0740-3224 , 1520-8540
    URL: Article
    DOI: 10.1364/JOSAB.35.000575
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2018
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  • 7
    Online Resource
    Online Resource
    Analysis of characteristics of few-mode fiber fusion splicing under dynamic spatial modecrosstalk
    Optica Publishing Group ; 2021
    In:  Applied Optics Vol. 60, No. 30 ( 2021-10-20), p. 9432-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 60, No. 30 ( 2021-10-20), p. 9432-
    Abstract: In this paper, an analytical model of the fusion splicing loss of few-mode fiber (FMF) under the condition of dynamic crosstalk is proposed. Under different dynamic spatial modal crosstalk caused by fusion mismatches and rotation angles, we analyze the variation trend of the fusion splicing loss characteristics of FMF with L P 01 , L P 11 a , and L P 11 b , respectively. Simulation results show that under the condition of axial misalignment introducing modal crosstalk, the splice loss of the L P 11 a and L P 11 b modes is higher than that of L P 01 . On the other hand, the modal crosstalk caused by rotation angles makes the fusion splice loss of L P 01 present symmetrical distribution, and the loss of fusion splice of L P 01 is maximum at 45°. When rotating from 0° to 90°, for L P 11 a and L P 11 b modes, the fusion loss of L P 11 a decreases gradually, while the loss of L P 11 b increases gradually. Both are in a symmetrical distribution. Meanwhile, we build an FMF fusion splice loss measurement system based on photon lanterns and FMF circulators. The experimental results show that it is consistent with the simulation results, and the experimental and simulation results confirm the feasibility of the fusion splice fault loss analysis modal under dynamic crosstalk conditions.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.439746
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 207387-0
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  • 8
    Online Resource
    Online Resource
    Graphene-supported tunable bidirectional terahertz metamaterials absorbers
    Optica Publishing Group ; 2021
    In:  Applied Optics Vol. 60, No. 22 ( 2021-08-01), p. 6520-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 60, No. 22 ( 2021-08-01), p. 6520-
    Abstract: Based on asymmetric graphene ellipses, the tunable propagation characteristics of metamaterial absorber (MMA) have been investigated in the THz region. Two distinct absorption peaks of 84% and 90% are observed at 1.06 THz and 1.67 THz, respectively. Besides a high Q factor exceeding 20, the Fano resonance can also be modulated in a wide range (e.g., the frequency modulation depth reaches more than 43.8% if the Fermi energy level changes in the range of 0.2–1.0 eV). Additionally, a bidirectional THz MMA is achieved by replacing the metal substrate with a uniform graphene layer. If the terahertz wave is incident in the forward direction, the proposed graphene double stripe microstructure shows a typical MMA with its absorption reaching 88%. On the other hand, if the terahertz wave is incident in the reverse direction, the graphene double stripe microstructure behaves as a reflective modulator, and its amplitude and frequency MD will reach 60% and 85%. These results contribute to the design of tunable THz devices, such as filters, absorbers, and modulators.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.427419
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 9
    Online Resource
    Online Resource
    Tunable terahertz Dirac-semimetal hybrid plasmonic waveguides
    Optica Publishing Group ; 2022
    In:  Optical Materials Express Vol. 12, No. 1 ( 2022-01-01), p. 73-
    Details
    In: Optical Materials Express, Optica Publishing Group, Vol. 12, No. 1 ( 2022-01-01), p. 73-
    Abstract: Based on the Dirac semimetals (DSM) modified hybrid plasmonic waveguides, the tunable propagation properties have been systematical investigated by using the finite element method in the THz region, including the influences of structural parameters, the shape of dielectric fiber and Fermi levels of DSM layers. The results show that as the operation frequency increases, the real part of propagation constant increases, and the loss shows a peak. The shape of dielectric fiber (the elliptical structural parameter δ) affects the propagation property obviously, as the structural parameter decreases, the confinement and figure of merit increase, the loss reduces. With the increase of Fermi level of DSM layer, the imaginary part of propagation constant decreases, the modulation depth of loss is more than 95% if the Fermi level changes in the range of 0.01-0.15 eV. In addition, as the permittivity of dielectric material filling in the slit increases, the mode confinement and loss increases, FOM decreases. The results are very helpful to understand the tunable mechanisms of hybrid waveguides and design novel plasmonic devices in the future, e.g. modulators, filters, lasers and resonators.
    Type of Medium: Online Resource
    ISSN: 2159-3930
    URL: Article
    DOI: 10.1364/OME.445362
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 2619914-2
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  • 10
    Online Resource
    Online Resource
    Flexible properties of THz graphene bowtie metamaterials structures
    Optica Publishing Group ; 2019
    In:  Optical Materials Express Vol. 9, No. 1 ( 2019-01-01), p. 44-
    Details
    In: Optical Materials Express, Optica Publishing Group, Vol. 9, No. 1 ( 2019-01-01), p. 44-
    Type of Medium: Online Resource
    ISSN: 2159-3930
    URL: Article
    DOI: 10.1364/OME.9.000044
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2019
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