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Large area silicon-air-silicon DBRs for infrared filter applications
摘要： This paper presents the design, fabrication, and optical characterization of silicon-based thin film Fabry-Pérot filters for spectroscopic sensing applications at short-wave infrared (SWIR: 1.5–2.5 μm) and mid-wave infrared (MWIR: 3–5 μm) wavelengths. Filter performance is enhanced using distributed Bragg reflectors composed of silicon and air-gap layers for enhanced refractive index contrast. A peak-to-peak surface variation of less than 20 nm in the fabricated micromachined structures was achieved across a large spatial area of 1 mm × 1 mm. Spectral measurements on released Fabry-Pérot filters show excellent agreement with optical simulations. The fabricated Fabry-Pérot filters demonstrate peak transmittance values greater than 50% across all spectral ranges, with measured full width at half maximum values in the range of 50 nm rendering them suitable for use in spectral sensing and imaging in the SWIR and MWIR wavelength ranges.
关键词： Silicon,Fabry-Perot interferometers,Spectroscopy,Optical device fabrication
更新于2025-09-23 15:22:29
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[IEEE 2020 Moscow Workshop on Electronic and Networking Technologies (MWENT) - Moscow, Russia (2020.3.11-2020.3.13)] 2020 Moscow Workshop on Electronic and Networking Technologies (MWENT) - Laser Optical Fiber Systems Prospects Use Evaluation
摘要： The paper considers the various fiber-optic devices, systems and its components improvement issues. The fiber-optic information-measuring systems structure questions on the fiber-optic devices basis are considered. The various fiber-optic devices, systems and its components dignity and benefits are shown. It is shown that fiber-optic laser measuring systems can be successfully used to measure pressure, temperature, linear and angular micro-displacements, vibration parameters, mechanical tensions, etc.
关键词： fiber optical device,information and measurement system,measurement,optical fiber,laser
更新于2025-09-23 15:21:01
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Plasmonics Induced Multifunction Optical Device via Hoof-Shaped Subwavelength Structure
摘要： The electromagnetic spectrum includes the frequency range (spectrum) of electromagnetic radiation and its corresponding wavelength and energy. Due to the unique properties of different frequency ranges of the electromagnetic spectrum, a series of functional devices working in each frequency rang have been proposed. Here, we propose a periodic subwavelength hoof-shaped structure array, which contains a variety of geometric configurations, including U-shaped and rectangle structures. The results show that the enhanced optical transmission (EOT) effect of the surface plasmon excited by the hoof-shaped structure is highly sensitive to the polarization of the incident light, which leads to the peak’s location shift and the amplitude intensity variety of transmission peaks of U-shaped structure in the case of coupling based on the surface plasmon of rectangle structure. In addition, take advantage of the EOT effect realized in the periodic hoof-shaped structure array, we propose a multifunctional plasmon optical device in the infrared range. By adjusting the polarization angle of the incident light, the functions of the optical splitter in the near-infrared range and the optical switch in the mid-infrared range are realized. Moreover, with the changes of the polarization angle, different proportions of optical intensities split are realized. The device has theoretically confirmed the feasibility of designing multifunctional integrated devices through a hoof-shaped-based metamaterial nanostructure, which provides a broad prospect for the extensive use of multiple physical mechanisms in the future to achieve numerous functions in simple nanostructures.
关键词： interaction between light and metallic film,plasmonic optical device,enhanced optical transmission,coupled mode theory
更新于2025-09-23 15:21:01
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High Speed Directly Modulated Fabry-Perot Lasers with an Ultra-Short Cavity Length
摘要： In this study, Fabry-Perot quantum well lasers with shortened cavity designs (25 and 50 μm) were fabricated. The devices had dry-etched and cleaved facets that exhibited an output power of up to 2.36 mW for a cavity length of 25 μm; good spectral performance was achieved. Single-optical-mode operation with better than 25dB of side mode suppression ratio can be achieved for the fabricated devices with 25- and 50-μm cavities. The short-cavity devices also exhibited high-speed modulation at elevated temperatures. Moreover, 25 Gb/s eye diagrams could be obtained at 65oC for the 25 μm device and 55oC for the 50 μm device. Due to their small area, ultra-short-cavity Fabry-Perot laser can be suitably used in next-generation light sources for optical communication.
关键词： Optical device fabrication,Semiconductor lasers,Laser cavity resonators,Amplitude modulation,Diode lasers,Quantum well lasers,Laser modes
更新于2025-09-23 15:21:01
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Active broadband manipulation of terahertz photonic spin based on gyrotropic Pancharatnam-Berry metasurface
摘要： Controlling terahertz (THz) waves, especially the polarization state and deflection angle, is important in THz application systems. But most of conventional THz metasurfaces have limitations in efficiency and working bandwidth. Although Pancharatnam-Berry excellent manipulation for the circular polarized (CP) waves (or called photonic spin states) without phase dispersion, there is still challenge in active controlling. Here, we developed a magnetically tunable gyrotropic P-B metasurface by combining the gyroelectric semiconductor InSb and the P-B elements, which obtain two important effects: One is the active photonic spin Hall effect, which controls the conversion between two CP states and the deflection in space. A broadband working frequency of 1.02~1.7 THz is obtained with the sweeping deflection angle from 36.6° to 83.5° and the highest efficiency of over 70%. The other is photonic spin filter effect, which reflects one CP state but absorb the other orthogonal CP state, realizing nonreciprocal absorption with the isolation of 24 dB. This active, high efficiency and broadband P-B metasurface opens a new way in manipulation of the THz wave propagation and polarization states in both space and frequency domains.
关键词： Magneto-optical device,terahertz,subwavelength structure
更新于2025-09-23 15:21:01
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Integration of chiral cellulose nanocrystal films in silica optical fibers
摘要： Cellulose nanocrystals have attracted great attention as new “wonder” materials for photonic applications owing to their unique property of spontaneous self-assembly to form chiral nematic films. Here, the incorporation of chiral cellulose nanocrystal films on a photonic waveguide is demonstrated for the first time – in the form of integrated silica optical fibers with a helicoid nanocrystal film on their input facet. In order to achieve repeatable cholesteric ordering across the fiber core modal area, a fabrication method was developed where several optical fiber facets form part of a larger flat surface, which acts as the substrate for the planar anchoring of the cellulose nanocrystals. The resultant optical fibers exhibit significant circular dichroism (almost 40%) in transmission and act as all-fiber spectral filters. The proposed fabrication technique provides a simple, low-cost method for developing chiral silica optical fibers that remain compatible with standard telecommunication fiber technology. It is envisioned that the incorporation of cellulose nanocrystals in other optical fiber types will enable the development of a new class of fiber devices.
关键词： optical films,optical device fabrication,optical materials,optical polarization,fiber optics,optical fibers,optical fiber devices
更新于2025-09-23 15:19:57
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[IEEE 2019 20th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM) - Erlagol (Altai Republic), Russia (2019.6.29-2019.7.3)] 2019 20th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM) - Simulation of High-Speed Electro-Optical Device for Fire Detection at Early Stage under the Influence of Dynamic Optical Noise
摘要： The simulation of high-speed electro-optical device for fire detection under the influence of dynamic optical interference on the entrance pupil is performed. The analysis of known approaches to providing noise immunity of the device is performed: use of selected spectral ranges of control; the use of additional channels of the device (hardware redundancy); the use of additional algorithms for signal processing channels of the device (software redundancy). Analytical dependences for modeling are formulated. The simulation is performed. Calculation of the mathematical model was made using software package Matlab and the development environment RAD Studio. The characteristics of changes in spectral ratios depending on the temperature of the filament body are obtained. The spectral flux of the incandescent lamp is calculated from the dynamics of the temperature change of the incandescent body. As result of modeling, the spectral ranges of control – 1350±50, 2700±50 and 4300±50 nm were selected, and their ratios were based. Ratios of Q2700-1350 for the spectral flow of a fire and incandescent bulbs made up 10.9 and 0.164 respectively. Ratios of Q2700-4300 hearth and bulbs amounted to 1.34 and 4.13, respectively. The values of the ratios established in the range for Q2700-1350 from 10.748 to 0.784 for Q2700-4300 from 1.354 to 1.557for total flow with changes lamp. The characteristic values of the ratios changes characterizing the fire and the incandescent lamp and allowing to detect the radiation of the source against the background of optical interference are determined. Additional studies on the basis of the developed model should be carried out to more accurately identify the source of fire under the influence of dynamic optical interference.
关键词： electro-optical device,model,optical hindrance,model operation,algorithm,filament lamp
更新于2025-09-23 15:19:57
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Tunable hybrid spectral filter and time-division multiplexing of second-order fluorescence controlled by phonon and dressing on Pr <sup>3+</sup> :YSO
摘要： Atom-like nonlinear responses of rare earth doped crystal Pr3+:Y2SiO5 (Pr3+: YSO) exhibit unique features compared with other nonlinear crystals. The responses become more interesting, while Pr3+: YSO is modulated simultaneously by temperature and multi-parameters related to dressed state. The generations of Stokes and fluorescence (FL) signals are demonstrated in both time and spectral domains. Here, we are presenting a new controlling strategy by interaction between dressing and phonon on Pr3+: YSO to manipulate the intensity of Stokes and FL signals. Interaction between dressing and phonon leads to more stable nonlinear response of the YSO crystal, which is very important for integrated quantum photonic device stability and multi-functionality. Also, we have realized tunable hybrid spectral filter (narrow-band pass notch filter (NBPNF), narrow-band stop notch filter (NBSNF)) and time-division multiplexing router on Pr3+: YSO by controlling the interaction between dressing and phonons. Tunable hybrid spectral filter and pure NBPNF are realized from dressing dip of Autler-Townes (AT) splitting and spectral intensity Stokes emission peak. Also, time-division multiplexing router is realized by time-domain adiabatic expansion. Furthermore, optical switch between tunable hybrid spectral filter to pure NBPNF is realized from dressing dip (AT splitting) to spectral intensity Stokes emission peak. Our experimental results suggests advanced technique for realizing tunable hybrid spectral filter with a contrast of about 98%, and optical time-division multiplexing router with channel equalization is about 85%.
关键词： four wave mixing,nonlinear optics,dressing,hybrid,optical device,fluorescence and phonon,filter
更新于2025-09-23 15:19:57
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Optical Properties of Electrically Active Gold Nanoisland Films Enabled with Interfaced Liquid Crystals
摘要： A system comprising a gold nanoisland film (Au NIF) covered with a liquid crystal (LC) material is introduced. By applying a voltage across the LC bulk, we demonstrate that changes in the refractive-index and orientation significantly modified the hybrid plasmonic–photonic resonances of the Au NIF. The hybrid structure enabled active control of the spectrum of the resonance wavelength of the metallic nanoisland by means of an externally applied electric field. Our modeling supports the observed results in LC/Au NIF. In a combination of the nanostructured surface with birefringent LCs, nonpolarized wavelength tunability of ~15 nm and absorbance tunability of ~0.024 were achieved in the visible wavelength, opening the door to optical devices and nanoscale sensors.
关键词： optical device,gold nanoisland film,liquid crystal
更新于2025-09-19 17:13:59
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Radiative properties of scattering media containing directionally controlled nanofibers
摘要： Directional control of radiation could be useful in a range of scientific and industrial applications. This study evaluated the possibility of directional control of radiation using nanofibers. Herein, scattering media containing directionally controlled nanofibers were assembled, and their relative directional radiative intensity was measured by constructing an optical system comprising a paraboloidal mirror and a charge-coupled device (CCD) camera. The influence of polarized light on relative light intensity was confirmed and compared to the theoretical result of a single nanofiber. The scattering direction of the scattered light was found to differ based on the material and size of the nanofibers. In addition, the scattering direction of the scattered light changed according to the incident angle of the irradiated light. Therefore, the results of this study suggest that radiation can be directionally controlled using a scattering medium containing nanofibers with controlled orientations.
关键词： Nanofiber,Scattering media,Optical device,Radiative property,Directional control
更新于2025-09-16 10:30:52