- 标题
- 摘要
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- 实验方案
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Low-Voltage, Coupled Multiple Quantum Well Electroreflective Modulators towards Ultralow Power Inter-Chip Optical Interconnects
摘要： An electroreflective modulator based on multiple-pass electroabsorption (EA) of coupled multiple quantum wells (CMQWs) is demonstrated for integration with low-loss polymer optical waveguides towards inter-chip and on-board optical interconnects at 850 nm. Taking advantage of coupling between quantum states in MQWs, the top polymer cladding and the bottom Au mirror form a Fabry-Pérot cavity to further enhance the EA of CMQWs, thereby greatly improving the extinction ratio (ER) at a low voltage. The device achieves an ER of ~6 dB and an insertion loss (IL) <3 dB at 2 V, notably outperforming conventional surface-incident EA modulators at the same driving voltage. A further optimized modulator design can achieve a peak ER of 9-12 dB at 2V with a low IL of 2-3 dB and a relatively broad spectral bandwidth of ~10 nm. The low capacitance and reverse bias operation at a low voltage potentially offer ~10× lower power consumption compared to direct modulation of 850 nm lasers. This simple surface-incident CMQW modulator is a promising candidate for integration with ultralow power inter-chip and on-board interconnect architectures.
关键词： Modulator,Coupled Multiple Quantum Wells,Optical Interconnect,Fabry-Perot cavity,Electroabsorption
更新于2025-09-23 15:21:01
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Controllable tuning of Fabrya??Perot cavities <i>via</i> laser printing
摘要： The Fabry–Perot (FP) cavity is one of the basic optical components that has been widely applied in interferometry, spectroscopy, lasers and optoelectronic devices. Currently, tailorable FP cavities are highly desirable for fast and in situ modulation, which is crucial for optoelectronic devices and their integration. Here a simple tuning strategy of FP cavity mode is developed based on the plasmon-assisted laser printing technique. The laser irradiation induces photochemical and/or photothermal degradation of the polymer medium in the cavity, which is highly dependent on the film thickness and laser power. Thus, the FP cavity mode can be precisely and continuously tuned with irradiation time, which is then monitored using reflection spectra. Such a laser printing strategy is facile and general, which is capable of generating different structural colours.
关键词： laser printing,structural colours,plasmon-assisted,photochemical degradation,photothermal degradation,Fabry–Perot cavity
更新于2025-09-23 15:21:01
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A metasurfacea??enabled wideband higha??gain duala??circularlya??polarized Fabrya??Perot resonator antenna
摘要： This paper presents a wideband high-gain dual-circularly-polarized (CP) antenna with a simple configuration. Instead of improving the gain using the dual-CP element array, the Fabry-Perot resonator antenna concept is applied in this work. By designing a dual-linearly-polarized Fabry-Perot resonator antenna and a linear-to-circular polarization (LP-CP) metasurface polarizer separately and combining them, a wideband high-gain dual-CP antenna can be achieved. Structural simplicity and less design difficulty are advantages of the antenna design. Experimental results validate the design concept. It exhibits 3-dB axial-ratio bandwidths of over 12% for both LHCP and RHCP performance, a high polarization isolation of over 25 dB, and peak gains of 12.78 dBi and 12.89 dBi for LHCP and RHCP radiations respectively.
关键词： wideband,metasurface,dual-circularly-polarized,high-gain,Fabry-Perot resonator antennas
更新于2025-09-23 15:21:01
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Multilayer dielectric coated Fabry Perot spectral beam combiner for high power, narrowband, widely tunable laser applications
摘要： Spectral beam combination of tunable laser beams demonstrated, using a multilayer dielectric coated single cavity Fabry Perot (FP) filter. A stack of 19 layers using TiO2 and SiO2 was optimally designed and fabricated using an electron beam evaporation technique. This filter was characterized for transmission spectrum, surface morphology and laser induced damage threshold. The sharp transmission spectrum facilitated the spectral combination of closer wavelengths (< 10 nm) around 632.8 nm. This filter was utilized as an efficient spectral beam combiner as well as an amplified spontaneous emission (ASE) filter for the transmitting wavelength. This study finds direct application for tunable, multi-wavelength laser-based differential absorption lidar (DIAL) and atmospheric remote sensing applications. The application of this device was successfully demonstrated to spectrally combine high power, tunable copper vapor laser pumped dye laser beams. A mechanism to tune the FP transmission profile along with laser beam tunability was established.
关键词： Fabry Perot beam combiner,Widely tunable laser,Amplified spontaneous emission filtering,Angle tuning mechanism,Closer wavelength spectral beam combination
更新于2025-09-23 15:21:01
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An Optical Fiber Fabrya??Perot Pressure Sensor with Optimized Thin Microbubble Film Shaping for Sensitivity Enhancement
摘要： A pressure-assisted arc discharge method of preparing silicon microbubbles with a glass tube was utilized for decreasing the bubble film’s thickness and improving the bubble’s uniformity. By controlling the arc discharge intensity, discharge time and the position of the fiber carefully, the thickness of the microbubble film was reduced to the micrometer scale. Later, the thin film of the microbubble was transferred to the end the single-mode-fiber/glass-tube structure, for forming the FP (Fabry–Perot) interference cavity. As the thin film is sensitive to the outer pressure, such a configuration could be used for a high-sensitive-pressure measurement. Experimental results show that the sensitivity of this FP (Fabry–Perot) cavity was 6790 pm/MPa when the outer pressure ranges from 100 to 1600 kPa, and the relationship between the structural parameters of the thin film and the outer pressure was theoretically analyzed. Moreover, this special structure made of the end silicon film microbubble is more suitable for high-sensitivity applications.
关键词： interference cavity,pressure sensing,FP (Fabry–Perot),microbubble
更新于2025-09-23 15:21:01
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High-sensitivity strain sensor with an in-fiber air-bubble Fabry-Perot interferometer
摘要： We present a laser machining method for fabricating an all-fiber pillar-in-bubble Fabry-Perot interferometer (FPI), which is used for strain sensors with high sensitivity. The micro-structure of the air-bubble is fully controllable, especially the cavity length and sidewall thickness. The measured sensitivity of this strain sensor is as high as 56.69 pm/με, which is several times higher than that of most FPI strain sensors reported to date. This sensor also has a low-temperature sensitivity of 0.682 pm/°C, reducing the cross-sensitivity between tensile strain and temperature to 0.012 με/°C. Furthermore, such a sensor has the benefits of flexible design, simple fabrication, and high reproducibility, making it attractive for practical applications.
关键词： high sensitivity,fiber optic,Fabry-Perot interferometer,laser machining,strain sensor
更新于2025-09-23 15:21:01
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A highly sensitive optofluidic-gas sensor using two dimensional photonic crystals
摘要： Photonic crystals (PCs) are optical structures based on periodic arrays of dielectric materials. These structures enable the manipulation of photons as semiconductors do for electrons. Many optical devices with miniature sizes have been designed based on novel properties of PCs. In this paper, we proposed a new refractive index sensor with high sensitivity and high quality factor, which is implemented in a two dimensional PC with a hexagonal lattice structure. The proposed sensor has been constructed using a PC waveguide surrounded by two rows of ring-shaped holes. The emersion of Fabry-Perot interference pattern within the transmission band and its role in the determination of the features of the proposed refractive index sensor has been investigated. The finite-difference time-domain simulation results indicate that in the case of filling the holes of central waveguide and its surrounding ring-shaped holes by different materials with refractive indices from n = 1 to n = 1.5, a high sensitivity of 575 nm/RIU and a high quality factor of 7070 is achieved, which makes the proposed design applicable for liquid and also gas sensing.
关键词： sensing waveguide,quality factor,sensitivity,Fabry-Perot oscillation,gas sensor,photonic crystal
更新于2025-09-23 15:21:01
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[IEEE 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2018) - Nagoya, Japan (2018.9.9-2018.9.14)] 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - N ovoFEL as Source of Powerful Ultramonochromatic Tunable Terahertz Radiation
摘要： Laser nature of a continuous pulse-periodical radiation of the Novosibirsk free-electron laser (NovoFEL) appears in a good coherency of its pulses and very narrow synchronized longitudinal modes. Filtration of one of the modes by a system of three resonance Fabry-Perot interferometers allows to create laser source with monochromaticity which is sufficient for typical high-resolution THz spectroscopy (δf/f ≤ 5·10-8, δf ≤ 0.1 MHz). Features of the source compared to other alternative devices are a wide tuning range (1.5-3 THz) and much more high output power (up to 50-100 mW).
关键词： high-resolution spectroscopy,Fabry-Perot interferometers,monochromaticity,NovoFEL,terahertz radiation
更新于2025-09-23 15:21:01
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Infrared plasmonics: STEM-EELS characterization of Fabry-P??rot resonance damping in gold nanowires
摘要： Materials possessing strong midinfrared responses are of current interest because of their potential application to long-wavelength metamaterials, photonic devices, molecular detection, and catalysis. Here, we utilize high-energy resolution (80 cm?1, 10 meV) electron-energy-loss spectroscopy (EELS) in a monochromated and aberration-corrected scanning transmission electron microscope (STEM) to resolve multipolar surface plasmon resonances (SPRs), sometimes called Fabry-Pérot (FP) resonances, in gold nanowires with mode energies spanning from ～1000 to 8000 cm?1. STEM-EELS provides access to these mid- to near-IR responses in a single acquisition, avoiding the difficulties inherent in obtaining the same data using near-field optical techniques. The experimentally measured FP resonance energies and linewidths, together with analytical modeling and full-wave numerical electrodynamics simulations, provide a comprehensive picture of the radiative and intrinsic contributions to the total damping rates. We find some FP modes with dephasing times >60 fs, which is almost twice the longest previously reported plasmon dephasing time for individual Au nanoparticles in the infrared. The long dephasing times and the broad tunability of the FP resonance energies throughout the infrared region suggest additional opportunities for harnessing infrared plasmonic energy before dephasing occurs.
关键词： gold nanowires,plasmon dephasing times,Fabry-Pérot resonance,infrared plasmonics,STEM-EELS
更新于2025-09-23 15:19:57
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Advances in inorganic and hybrid perovskites for miniaturized lasers
摘要： The rapid advancement of perovskite-based optoelectronics devices has caught the world’s attention due to their outstanding properties, such as long carrier lifetime, low defect trap density, large absorption coefficient, narrow linewidth and high optical gain. Herein, the photonic lasing properties of perovskites are reviewed since the first stimulated emission of perovskites observed in 2014. The review is mainly focused on 3D structures based on their inherently active microcavities and externally passive microcavities of the perovskites. First, the fundamental properties in terms of crystal structure and optical characteristics of perovskites are reviewed. Then the perovskite lasers are classified into two sections based on the morphology features: the ability/inability to support lasing behaviors by themselves. Every section is further divided into two kinds of cavities according to the light reflection paths (Standing wave for the Fabry–Pérot cavity and travelling wave for the Whispering-Gallery-Mode cavity). The lasing performance involves fabrication methods, cavity sizes, thresholds, quality factors, pumping sources, etc. Finally, some challenges and prospects for perovskite lasers are given.
关键词： Fabry–Pérot cavity,Whispering Gallery Mode,semiconductor,laser,ASE,perovskite
更新于2025-09-23 15:19:57