High Quality Factor Surface Fabry-Perot Cavity of Acoustic Waves

耦合空间线圈Fabry-Perot谐振器的亚波长声屏蔽

Subwavelength sound screening by coupling space-coiled Fabry-Perot resonators

我们探索宽带和全向低频声屏蔽的基础上局部共振声学超材料。我们表明，不同的谐振模式的耦合支持的法布里-珀罗腔可以有效地产生不对称的传输频谱中的线型，导致宽带声不透明度。法布里-珀罗腔是空间螺旋的，以移动衍射边缘下的谐振模，这保证了所有入射角的不透明带。事实上，深亚波长特征的空腔导致避免衍射，已被证明是主要限制的全向能力的局部共振穿孔板。我们在实验中达到了几十dB的衰减在低频，超材料厚度比波长（λ/ 15）小15倍。所提出的设计可以被认为是一个新的构建块的声学超表面具有高水平的声波操纵。

Dark-modes excitation in coupled nano Fabry-Perot structure induced by symmetry breaking

Absorbing metamaterials have attracted a widespread interest but suffer from the metallic ohmic losses that limits their Q-factor to values around 10. In this paper, we report the engineering and experimental characterization of a high Q dark-mode in a metasurface resulting from the coupling of several individual nano-Fabry-Perot structures supporting low-contrast resonances. The resulting resonance has a Q-factor above 20 and a nearly total absorption. Moreover, we also demonstrate that several dark-mode resonances can be excited simultaneously, by exploiting the coupling of various pairs of …

Fabry-Pérot Cavity Formed with Dielectric Metasurfaces in a Hollow-Core Fiber

We demonstrate a fiber-integrated Fabry-Pérot cavity formed by attaching a pair of dielectric metasurfaces to the ends of a hollow-core photonic-crystal fiber segment. The metasurfaces consist of perforated membranes designed as photonic-crystal slabs that act as planar mirrors but can potentially allow injection of gases through their holes into the hollow core of the fiber. We have so far observed cavities with finesse of ~11 and Q factors of ~$4.5 \times 10^5$, but much higher values should be achievable with improved fabrication procedures. We expect this device to enable development of ne…

磁振子法布里-珀罗谐振器作为可编程移相器

Magnonic Fabry-Pérot resonators as programmable phase shifters

提出由 YIG 薄膜与 CoFeB 纳米条带耦合构成的磁振子法布里-珀罗谐振器，通过 SNS-MOKE 与模拟验证其可由磁开关调控产生 π 相移，适用于可重构自旋波计算。

Fabry-Perot Lasers as Enablers for Parallel Reservoir Computing

We introduce the use of Fabry-Perot (FP) lasers as potential neuromorphic computing machines with parallel processing capabilities. With the use of optical injection between a master FP laser and a slave FP laser under feedback we demonstrate the potential for scaling up the processing power at longitudinal mode granularity and perform real-time processing for signal equalization in 25 Gbaud intensity modulation direct detection optical communication systems. We demonstrate the improvement of classification performance as the number of nodes increases and the capability of simultaneous process…

Tunable mid-wave infrared Fabry-Perot bandpass filters using phase-change GeSbTe

We demonstrate spectrally-tunable Fabry-Perot bandpass filters operating across the MWIR by utilizing the phase-change material GeSbTe (GST) as a tunable cavity medium between two (Ge:Si) distributed Bragg reflectors. The induced refractive index modulation of GST increases the cavity's optical path length, red-shifting the passband. Our filters have spectral-tunability of ~300 nm, transmission efficiencies of 60-75% and narrowband FWHMs of 50-65 nm (Q-factor ~70-90). We further show multispectral thermal imaging and gas sensing. By matching the filter's initial passband to a CO$_{2}$ vibratio…