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  • Optica Publishing Group  (23)
  • 2020-2024  (23)
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  • Optica Publishing Group  (23)
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Language
Years
  • 2020-2024  (23)
Year
  • 1
    Online Resource
    Online Resource
    Local OAM manipulation of a terahertz wave from the air filament by chirping the few-cycle vortex pump laser
    Optica Publishing Group ; 2022
    In:  Optics Express Vol. 30, No. 6 ( 2022-03-14), p. 9727-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 30, No. 6 ( 2022-03-14), p. 9727-
    Abstract: We propose a scheme to manipulate the local orbital angular momentum (OAM) of the ultra-broadband (0.1–30 THz) terahertz (THz) waves from the laser-induced short air filament via chirping the few-cycle vortex laser pump. The simulation results show that either the THz vortex pulses with linear azimuth-dependent phases or the THz angular accelerating vortex beams (AAVBs) with nonlinear azimuth-dependent phases can be produced by tuning the chirp parameter of the pump. Thus, the dominant physical mechanism for THz generation can be determined. The THz temporal and transverse spatial distributions can be also controlled by the chirp parameter. Furthermore, their local OAM density distributions present very complex structures because most of the modulated azimuthal intensity and the corresponding local angular helicity distributions are not able to cancel out completely. Via analyzing the simulated THz results at the different pump intensities, we classify the initial pump intensity into three cases. For the low intensity case, the Kerr effect comes into prominence, so the generated THz radiation shall be vortex pulses. While for the high intensity case, the leading plasma effect dominates. In contrast, when the pump intensity is at the medium level, the Kerr nonlinearity and the plasma effect may be comparable and competitive. Basically, THz AAVBs are generated for both high and medium intensity cases. Our study will provide the possibility for studying the optically induced rotation technology more intuitively from the perspective of angular momentum transfer.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.452414
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 1491859-6
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  • 2
    Online Resource
    Online Resource
    Performance optimization of a reservoir computing system based on a solitary semiconductor laser under electrical-message injection
    Optica Publishing Group ; 2020
    In:  Applied Optics Vol. 59, No. 23 ( 2020-08-10), p. 6932-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 59, No. 23 ( 2020-08-10), p. 6932-
    Abstract: A simple reservoir computing (RC) system based on a solitary semiconductor laser under an electrical message injection is proposed, and the performances of the RC are numerically investigated. Considering the lack of memory capacity (MC) in such a system, some auxiliary methods are introduced to enhance the MC and optimize the performances for processing complex tasks. In the pre-existing method, the input information is the current input data combined with some past input data in a weighted sum in the input layer (named as M -input). Another auxiliary method (named as M -output) is proposed to introduce the output layer for optimizing the performances of the RC system. The simulated results demonstrate that the MC of the system can be improved after adopting the auxiliary methods, and the effectiveness under adopting the M -input integrated with the M -output (named as M -both) is the most significant. Furthermore, we analyze the system performances for processing the Santa Fe time series prediction task and the nonlinear channel equalization (NCE) task after adopting the above three auxiliary methods. Results show that the M -input is the most suitable for the prediction task while the M -both is the most appropriate for the NCE task.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.394999
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
    detail.hit.zdb_id: 207387-0
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  • 3
    Online Resource
    Online Resource
    Wideband multiwavelength Brillouin fiber laser with switchable channel spacing
    Optica Publishing Group ; 2023
    In:  Applied Optics Vol. 62, No. 8 ( 2023-03-10), p. 2130-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 62, No. 8 ( 2023-03-10), p. 2130-
    Abstract: A multiwavelength Brillouin fiber laser (MBFL) with a switchable channel spacing is demonstrated using a 1.55-µm single-mode AlGaInAs/InP hybrid square–rectangular laser as a seeding source. The scheme employs a highly nonlinear fiber loop with a feedback path to generate a 10-GHz-spacing MBFL. Then, assisted by a tunable optical bandpass filter, MBFLs with spacing from 20 GHz to 100 GHz at a step of 10 GHz are generated in another highly nonlinear fiber loop based on the cavity-enhanced four-wave mixing. More than 60 lasing lines with an optical signal-to-noise ratio over 10 dB are obtained successfully in all the switchable spacings. The total output power and the channel spacing of the MBFLs are proved to be stable.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.484122
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
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  • 4
    Online Resource
    Online Resource
    Efficient method for the compensation of dispersion mismatch in the frequency-scanning interferometry
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 25 ( 2021-12-06), p. 42127-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 25 ( 2021-12-06), p. 42127-
    Abstract: Absolute distance measurements could be achieved by the technique of frequency scanning interferometry (FSI), which could provide a micron-level accuracy over several tens of meters. However, as the scanning range and distance increasing, the measurement accuracy and resolution would be seriously influenced by the dispersion mismatch effect, which is mainly caused by the dispersion difference between optical fiber and air. A dispersion compensation method was proposed in this paper, and the mismatch effect would be suppressed effectively without complicated calculations for each single measurement. The chirp in resampling clock would be corrected with a pre-calibration procedure, and the compensation factor is demonstrated for different distances. A calibration method of dispersion compensation factor is also proposed, and the linear regression residual is employed as the criterion. Then, the compensation method is evaluated by experiments with different spatial distances and scanning ranges. Finally, a 60-m experiment is carried out for accuracy comparison, and the measurement accuracy is better than 15 µm by comparing with commercial interferometers.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.437675
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Unidirectional light emission in a deformed circular-side triangular microresonator
    Optica Publishing Group ; 2023
    In:  Optics Express Vol. 31, No. 9 ( 2023-04-24), p. 14560-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 31, No. 9 ( 2023-04-24), p. 14560-
    Abstract: A waveguide-connected deformed circular-side triangular microresonator is proposed and fabricated. Room temperature unidirectional light emission is experimentally demonstrated in the far-field pattern with a divergence angle of 38°. Single mode lasing at 1545.4 nm is realized at an injection current of 12 mA. The emission pattern changes drastically upon the binding of a nanoparticle with radius down to several nanometers, predicting applications in electrically pumped, cost-effective, portable and highly sensitive far-field detection of nanoparticles.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.485160
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
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  • 6
    Online Resource
    Online Resource
    Highly efficient waveguide-coupled output in asymmetrically deformed square cavity microlasers
    Optica Publishing Group ; 2023
    In:  Optics Letters Vol. 48, No. 7 ( 2023-04-01), p. 1874-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 48, No. 7 ( 2023-04-01), p. 1874-
    Abstract: We propose and demonstrate deformed square cavity microlasers for realizing highly efficient output from a connected waveguide. The square cavities are deformed asymmetrically by replacing two adjacent flat sides with circular arcs to manipulate the ray dynamics and couple the light to the connected waveguide. The numerical simulations show that the resonant light can efficiently couple to the fundamental mode of the multi-mode waveguide by carefully designing the deformation parameter utilizing global chaos ray dynamics and internal mode coupling. An enhancement of approximately six times in the output power is realized in the experiment compared to the non-deformed square cavity microlasers, while the lasing thresholds are reduced by about 20%. The measured far-field pattern shows highly unidirectional emission agreeing well with the simulation, which confirms the feasibility of the deformed square cavity microlasers for practical applications.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.486221
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 243290-0
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  • 7
    Online Resource
    Online Resource
    Numerical simulation of all-optical logic gates based on hybrid-cavity semiconductor lasers
    Optica Publishing Group ; 2021
    In:  Journal of the Optical Society of America A Vol. 38, No. 6 ( 2021-06-01), p. 808-
    Details
    In: Journal of the Optical Society of America A, Optica Publishing Group, Vol. 38, No. 6 ( 2021-06-01), p. 808-
    Abstract: All-optical switch and multiple logic gates have been demonstrated using a hybrid-cavity semiconductor laser composed of a square microcavity and a Fabry–Perot cavity experimentally. In this paper, two-section tri-mode rate equations with optical injection terms are proposed and applied to study all-optical logic gates of NOT, NOR, and NAND operations utilizing the hybrid-cavity laser. Steady-state and dynamical characteristics of all-optical multiple logic gates are simulated, taking into account the influence of mode frequency detuning, gain suppression coefficients, mode Q factor, injection energy, and biasing current. All-optical logic NOT, NOR, and NAND gates up to 20, 15, and 20 Gbit/s are obtained numerically with dynamic extinction ratios of over 20, 20, and 10 dB, respectively, which are potential response speeds of the all-optical logic gates based on the hybrid-cavity semiconductor lasers.
    Type of Medium: Online Resource
    ISSN: 1084-7529 , 1520-8532
    URL: Article
    DOI: 10.1364/JOSAA.422005
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    SSG: 24,1
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  • 8
    Online Resource
    Online Resource
    Manipulation of lasing modes in a circular-side octagonal microcavity laser with a spatially distributed current injection
    Optica Publishing Group ; 2021
    In:  Optics Express Vol. 29, No. 24 ( 2021-11-22), p. 39685-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 29, No. 24 ( 2021-11-22), p. 39685-
    Abstract: We propose and demonstrate a circular-side octagonal microcavity (COM) semiconductor laser with a spatially distributed current injection for manipulating the lasing modes. There are two types of high-quality-factor whispering-gallery (WG) modes with distinct field patterns in a COM: the four-bounced quadrilateral modes and the eight-bounced octagonal modes. By designing two separated p-electrodes, the COM laser is divided into two regions that are pumped independently to select specific modes for lasing. The two types of WG modes lase simultaneously when the two regions are injected with equivalent currents. Degeneracy removal of the quadrilateral modes is observed in both simulation and experiment when the two regions are injected with inequivalent currents. The quadrilateral modes are suppressed when one of the two regions is un-injected or biased with a negative current, and single-octagonal-mode lasing is realized. The results show that the lasing modes can be efficiently manipulated with the spatially distributed current injection considering the distinct field patterns of different WG modes in the microcavities, which can promote the practical application of the microcavity lasers.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.441950
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
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  • 9
    Online Resource
    Online Resource
    Substrate-mediated plasmon hybridization toward high-performance light trapping
    Optica Publishing Group ; 2023
    In:  Optics Letters Vol. 48, No. 7 ( 2023-04-01), p. 1914-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 48, No. 7 ( 2023-04-01), p. 1914-
    Abstract: High-performance light trapping in metamaterials and metasurfaces offers prospects for the integration of multifunctional photonic components at subwavelength scales. However, constructing these nanodevices with reduced optical losses remains an open challenge in nanophotonics. Herein, we design and fabricate aluminum-shell–dielectric gratings by integrating low-loss aluminum materials with metal–dielectric–metal designs for high-performance light trapping featuring nearly perfect light absorption with broadband and large angular tuning ranges. The mechanism governing these phenomena is identified as the occurrence of substrate-mediated plasmon hybridization that allows energy trapping and redistribution in engineered substrates. Furthermore, we strive to develop an ultrasensitive nonlinear optical method, namely, plasmon-enhanced second-harmonic generation (PESHG), to quantify the energy transfer from metal to dielectric components. Our studies may provide a mechanism for expanding the potential of aluminum-based systems in practical applications.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.485506
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2023
    detail.hit.zdb_id: 243290-0
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  • 10
    Online Resource
    Online Resource
    Electromagnetic modeling and simulation of the biophoton propagation in myelinated axon waveguide
    Optica Publishing Group ; 2022
    In:  Applied Optics Vol. 61, No. 14 ( 2022-05-10), p. 4013-
    Details
    In: Applied Optics, Optica Publishing Group, Vol. 61, No. 14 ( 2022-05-10), p. 4013-
    Abstract: Biophotons in the nervous system are a potential carrier of neural signals. Previous experiments and studies indicated that biophotons are closely related to the neuronal activity and can propagate along myelinated axons. We establish a multilayer electromagnetic simulation model and demonstrate that the myelinated axon waveguide has low attenuation and low dispersion and operates in a narrow bandwidth on the order of 10 nm. We also find that the operating wavelength of the waveguide is almost linearly related to the axon diameter and the number of myelin layers. Each additional layer of the myelin sheath causes the operating wavelength of the myelinated axon waveguide to shift 52.3 nm to the long-wave direction, while an increase in the axon diameter of 1.0 µm causes the operating wavelength to shift 94.5 nm to the short-wave direction. These findings well explain the tendency of the spectral redshift among different species and the spectral blueshift during the aging process of mice. Via the analysis method in this paper, we can predict the wavelength of the propagating biophotons based on the neural structure.
    Type of Medium: Online Resource
    ISSN: 1559-128X , 2155-3165
    URL: Article
    DOI: 10.1364/AO.446845
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2022
    detail.hit.zdb_id: 207387-0
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