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Bound states in the continuum in the double-period rectangular hole arrays perforated in one layer of photonic crystal slab in the visible wavelength region
摘要： We investigate optical bound states in the continuum (BICs) supported by a photonic crystal (PhC) slab penetrated with two periodic rectangular hole arrays embedded each other parallelly and vertically. It proves that the tunable off-Γ BICs can be found in the structure of both types, but the at-Γ BICs can only be obtained in the parallel structure. Quality factors (Q-factor) are obtained extremely high exceeding 105 for both types of structures. The tunable off-Γ BICs can be modulated by the structure parameters. Especially, the sensitivity of the resonant wavelength on the surrounding medium refractive index change is very large for the structure in both types, and tunable off-Γ BICs can be tuned by varying the environmental index. The results above accord well from the finite difference time domain method (FDTD) and the temporal coupled mode theory (CMT), which are beneficial to design practical resonance elements based on optical BICs in various new optical applications.
关键词： Double-periodic rectangular hole arrays,Photonic crystal,Fano resonance,Bound state in the continuum
更新于2025-09-23 15:23:52
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Silicona??Waveguidea??Integrated Higha??Quality Metagrating Supporting Bound State in the Continuum
摘要： The photonic bound state in the continuum (BIC) is a spatially bounded eigen state that can be realized in the form of a supercavity mode with an ultrahigh quality factor. The high-quality supercavity resonance can be supported by photonic crystal slabs, asymmetric metasurfaces, and high-contrast gratings. However, these schemes all suffer from bulky device size and complex experimental setup. Herein, a silicon-waveguide-integrated high-quality metagrating is proposed and demonstrated as a new platform to manipulate the supercavity mode. The shallow-ridge metagrating is directly embedded in the silicon slab waveguide, so the input slab mode can be coupled into the resonant ridge mode, which can be further transformed into the supercavity mode by utilizing the intra-waveguide Fabry–Perot interference. Such an effect has been experimentally verified by the fabricated devices. The metagrating operating near the supercavity regime is also experimentally realized with a high quality factor ≈5200. As an application, such high-quality metagrating is exploited to realize the temperature sensing with a high temperature sensitivity ≈77 pm K?1. The proposed integrated metagrating provides a novel approach to harness the BIC, paving ways for a new class of BIC-based nanophotonic devices with high performance, chip-scale footprint, and long-term stability.
关键词： waveguides,bound state in the continuum,silicon photonics,metagrating
更新于2025-09-23 15:19:57
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Bound States in the Continuum in Magnetophotonic Metasurfaces
摘要： We analyze the enhancement mechanisms of magneto-optical effects in all-dielectric metasurfaces caused by the bound state in the continuum resonance. In a structure under study, a square lattice of bismuth substituted yttrium iron garnet nanodisks with an air hole displaced away from the disk axis, magneto-optical polarization and intensity effects reach 0.7° and 22%, respectively.
关键词： bound state in the continuum,magneto-optical effects,all-dielectric metasurfaces,bismuth substituted yttrium iron garnet
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Photoluminescence Enhancement Phenomena in Photonic Crystal Slabs Formed on Si Structures with the Self-Assembled Ge Nanoislands
摘要： The strong enhancement of photoluminescence intensity was observed in photonic crystal slabs realized on Si structures with the self-assembled Ge nanoislands. The observed phenomena are described in terms of the nanoislands – photonic crystal modes interaction.
关键词： Ge nanoislands,bound state in the continuum,photonic mode,photonic crystals,photoluminescence
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Photoluminescence Enhancement Phenomena in Photonic Crystal Slabs Formed on Si Structures with the Self-Assembled Ge Nanoislands
摘要： The strong enhancement of photoluminescence intensity was observed in photonic crystal slabs realized on Si structures with the self-assembled Ge nanoislands. The observed phenomena are described in terms of the nanoislands – photonic crystal modes interaction.
关键词： Ge nanoislands,photonic crystals,bound state in the continuum,photoluminescence,photonic mode
更新于2025-09-16 10:30:52
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Non-Markovian dynamics revealed at a bound state in the continuum
摘要： We propose a methodical approach to controlling and enhancing deviations from exponential decay in quantum and optical systems by exploiting recent progress surrounding another subtle effect: the bound states in the continuum, which have been observed in optical waveguide array experiments within this past decade. Specifically, we show that by populating an initial state orthogonal to that of the bound state in the continuum, it is possible to engineer system parameters for which the usual exponential decay process is suppressed in favor of inverse power law dynamics and coherent effects that typically would be extremely difficult to detect in experiment. We demonstrate our method using a model based on an optical waveguide array experiment and further show that the method is robust even in the face of significant detuning from the precise location of the bound state in the continuum.
关键词： optical waveguide array,bound state in the continuum,quantum decay,Non-Markovian dynamics
更新于2025-09-11 14:15:04