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Scalable fabrication of geometry-tunable self-aligned superlattice photonic crystals for spectrum-programmable light trapping
摘要： Superlattice photonic crystals (SPhCs) possess considerable potentials as building blocks for constructing high-performance devices because of their great flexibilities in optical manipulation. From the prospective of practical applications, scalable fabrication of SPhCs with large-area uniformity and precise geometrical controllability has been considered as one prerequisite but still remains a challenge. In this work, we developed an anodic aluminum oxide template-guided approach to realize Ni SPhCs with the maximum area (~500 mm2) ever reported. By virtue of the dual-pore self-alignment effect arising from the periodic anodization electric fields, uniform structures over large areas were obtained for Ni SPhCs. Meanwhile, the geometrical parameters for every array of nanopores in terms of pore depth, size, and morphology can be independently controlled due to the sequential pore-opening. Based on the experimental observation about the geometrical dependence of the light absorption for Ni dual-pore SPhCs, we further fabricated Ni SPhCs with simultaneously-shaped nanopores and nanoconcaves, which not only simplified the fabrication process but also achieved omnidirectional stably-strong (~95%) light absorption spectra. Optical simulations elucidated that surface plasmon resonance and cavity resonance are responsible for the strong light trapping. Notably, the fabrication technique is applicable to Ni SPhCs with different periodicities, leading to spectrally programmable light absorption spectra. With Ni SPhCs as solar absorber, the water evaporation efficiency of a solar steam generation system and the open circuit voltage of a solar thermoelectric generator demonstrated 2.3 and 2.5 times improvement, respectively.
关键词： geometrically tunable,surface plasmon resonance,self alignment,superlattice photonic crystal,cavity resonance,anodic aluminum oxide template
更新于2025-09-19 17:15:36
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Wideband Graphene Electro-Optic Modulator on 1D Photonic Crystal Cavity
摘要： Since the isolation of graphene monolayers in 2004, attention has turned to embedding this 2D material into optical components such as modulators, frequency convertors and optical clocks. Indeed, graphene exhibits some remarkable optical properties such as wideband optical absorption in both normal-incidence (free-space applications) and grazing-incidence (waveguide based applications), intrinsic supporting of surface plasmon polariton (SPP) waves, and a full catalogue of non-linear optical behaviors including saturable absorption and multiple-photon mixing phenomena. These optical properties can be activated and deactivated for a given free space wavelength by “doping” graphene using the same gating techniques developed for solid state electronics; for example, in the case of absorption modulation, one must shift the Fermi level such that its separation from the Dirac point in energy (called the chemical potential) is equal to at least half the photon energy in order to render graphene transparent. Nonetheless, as an atomically thin monolayer, graphene’s limited interaction with light in free space restricts its absorption to 2.3% across a wide spectral range for undoped samples.
关键词： electro-optic modulator,graphene,wideband,photonic crystal cavity
更新于2025-09-16 10:30:52
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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) - Ultrastrong coupling of plasmonic metamaterials and photons in a terahertz photonic crystal cavity
摘要： Light-matter interaction in the strong coupling regime is of profound interest for fundamental quantum optics and applications. Here, we report a new type of strong light-matter interaction of metamaterial ‘quasi-particles’ with photons in a photonic crystal cavity in the terahertz frequency range. The measured Rabi splitting shows a square-root dependence on the density of metamaterial unit cells, even for unit cells from two spatially separated planar metamaterials, indicating nonlocal collective strong interactions. These findings are of interest for the investigation of fundamental strong-coupling phenomena, but also for applications such as ultra-low-threshold terahertz polariton lasing, voltage-controlled modulators and frequency filters, and ultra-sensitive chemical and biological sensing.
关键词： strong coupling,light-matter interaction,metamaterial,nonlocal collective strong interactions,terahertz,Rabi splitting,photonic crystal cavity
更新于2025-09-12 10:27:22
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA, USA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - Dual-Mode Silicon Photonic Crystal Nanocavity Modulator with Indium Oxide Gate
摘要： We report an ultra-efficient indium oxide gated silicon photonic crystal nanocavity electro-optical modulator, which is based on a dual-mode operation of resonance tuning and electro-absorption. With only 0.35μm long electrode, we achieved a tuning efficiency of 250pm/V and a modulation strength of 4dB/V with 35% from electro-absorption.
关键词： silicon photonics,modulator,photonic crystal cavity,transparent conductive oxide
更新于2025-09-09 09:28:46
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[OSA CLEO: Applications and Technology - San Jose, California (2014..-..)] CLEO: 2014 - 2.5 D photonic crystal quantum cascade detector
摘要： Quantum cascade detectors are intersubband photodetectors that offer a vast design freedom. By combining it with a novel photonic crystal cavity, a significant improvement of the detectors performance could be achieved.
关键词： quantum cascade detector,intersubband photodetectors,photonic crystal cavity
更新于2025-09-09 09:28:46
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Hourglass nonlinear photonic crystal cavity for ultra-fast all-optical switching
摘要： In this paper, a new design of an ultra fast all optical switch based on a new photonic crystal cavity combined with Kerr effect is proposed and its performance is studied. Numerical methods such as plane wave expansion (PWE) and finite difference time domain (FDTD) are used to perform simulations and study the optical properties of the proposed switch. Switching from ON to OFF status occurred when the resonant wavelength is shifted due to Kerr effect. The simulation results show that switch has a high-speed response of ~15ps and since it has an ultra-small size of 273.24 μm2, it has a potential to be used in integrated optical-circuits.
关键词： All-optical switching,Finite-Difference Time-Domain method,Optical Kerr effect,Photonic crystal cavity
更新于2025-09-09 09:28:46