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Ultrasensitive refractive index sensor based on parallel-connected dual Fabry-Perot interferometers with Vernier effect
摘要： A kind of ultrasensitive refractive index sensor based on parallel-connected dual Fabry-Perot interferometers (FPIs) with Vernier effect is proposed and demonstrated. The open and closed cavity FPIs are used as the sensing and reference units, respectively. The Vernier effect is realized by superimposing the reflective comb spectra of the dual FPIs, which have slightly different free spectral ranges. The open groove of the open cavity FPI provides a convenient, efficient and economical method for filling in or draining out the cavity. The stability, repeatability and temperature response of the structures are investigated. Experimental results indicate that the proposed sensing structure features high sensitivity, good stability, quick and accurate measurement.
关键词： Refractive index sensing,Fabry-Perot interference,Vernier effect,Fiber-optic sensor
更新于2025-11-28 14:23:57
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[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Giant Dual-Mode Graphene-Based THz Modulator
摘要： We report a high-performance terahertz (THz) modulator with dual-operation mode. For the pulse operation mode, the proposed THz modulator has the advantage of high modulation depth (MD) and can operate in a broadband frequency range. We have experimentally achieved a MD larger than 90% for the fifth-order pulse THz echo at 0.8 THz and the MD stays larger than 75% in a broadband frequency range larger than 1 THz. While, for the coherent operation mode, the Fabry-Perot (F-P) interference effect has been taken into consideration and a MD larger than 75% at 0.76 THz has also been realized.
关键词： dual-operation mode,terahertz modulator,modulation depth,Fabry-Perot interference,graphene
更新于2025-09-11 14:15:04
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The Surface and Interface Engineering Multi-Layered Nanopore Films for Enhanced Fabry-Pérot Interferences
摘要： In this study, a broadly-tunable nanoporous thin film system with alternating layers of Ag/indium tin oxide (ITO)/CoFeB/ITO/Ag, which was fabricated on a porous anodic aluminum oxide (AAO) substrate, was presented, so as to achieve the flexible tailoring of the Fabry-Pérot interference. The experimental results demonstrated that the amplitude of the Fabry-Pérot interference of this system, which had only an Ag layer deposited on the AAO substrate, was 12 times higher than that of pure AAO film, aside from the tunable oscillation periods. This was mainly due to the fact that the Ag mirror greatly improved the reflectivity of the air/AAO interface, rendering the intensities of light reflected from the air/AAO and AAO/Al interfaces comparable, thereby forming an effective interference enhancement. Furthermore, the existence of the ferromagnetic CoFeB layer was capable of significantly improving the absorbance in the ultraviolet and visible spectral ranges, and, in particularly, the oscillation ranges could be extended to the near-infrared spectral range (> 2,600 nm) by utilizing an ITO with lower conductivity as a spacer layer, due to its material dispersion which was approximately equal to zero. This new nanoporous thin film system represents a powerful tool for the future development of ultrasensitive optical devices based on the Fabry-Pérot interference and investigation of many interesting physical phenomena.
关键词： Ag/ITO/CoFeB/ITO/Ag layers,Hybrid Materials,Magnetic,Plasmonics,AAO substrate,Fabry-Pérot interference,Nanoporous thin film,Optical
更新于2025-09-10 09:29:36