Journal ArticleDOI
Symmetry-protected mode coupling near normal incidence for narrow-band transmission filtering in a dielectric grating
Reads0
Chats0
TLDR
In this article, a narrow-band transmission filter is demonstrated near normal incidence that operates through relaxation of supported-mode selection rules and is explained in the context of group theory, where the transverse magnetic and transverse electric dispersion relations of a dielectric grating in the subwavelength and near-wavelength region using finite element modal analysis are determined.Abstract:
A narrow-band transmission filter is demonstrated near normal incidence that operates through relaxation of supported-mode selection rules and is explained in the context of group theory. We calculated the transverse magnetic and transverse electric dispersion relations of a dielectric grating in the subwavelength and near-wavelength region using finite element modal analysis and determine the modes' corresponding irreducible representations. Coupling to select transverse magnetic modes at normal incidence is optimized to yield broadband high reflectance that acts as the background for the transmission filter. While some modes couple at normal incidence, others are shown to remain inaccessible due to symmetry mismatch. Away from normal incidence, the reduced symmetry relaxes the selection rules, enabling weak coupling between the incident field and these symmetry-protected modes. This weak coupling produces narrow transmission bands within the opaque background. Furthermore, by choosing the plane of incidence to include or exclude the grating periodicity, we show that orthogonal mode sets can independently be selected to couple to the incident light, yielding separate transmission bands. This spectral filtering is experimentally demonstrated with a suspended silicon grating in the infrared spectrum ($7--14\ensuremath{\mu}\mathrm{m}$), which agrees well with simulated transmittance spectra and modal analysis.read more
Citations
More filters
Journal ArticleDOI
Bound states in the continuum
TL;DR: Bound states in the continuum (BICs) are waves that remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away.
Journal ArticleDOI
Acousto-optic modulation of photonic bound state in the continuum
Zejie Yu,Xiankai Sun +1 more
TL;DR: Control interactions between sound waves and locally trapped light waves could be used in integrated photonic circuits to reduce the amount of light loss during signal transmission and will enable many other applications of photonic BICs in the areas of microwave photonics and quantum information processing.
Journal ArticleDOI
Experimental observation of a polarization vortex at an optical bound state in the continuum
TL;DR: In this article, a one-dimensional grating supporting a transverse magnetic mode with a BIC near 700 nm wavelength was studied and the existence of the BIC was verified using reflection measurements, which showed a vanishing reflection feature.
Journal ArticleDOI
Meta-optics and bound states in the continuum
TL;DR: In this paper, the authors discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum (BICs), and propose novel applications of the BIC physics to all-dielectric optical metasurfaces with broken-symmetry meta-atoms.
Journal ArticleDOI
Transition from Optical Bound States in the Continuum to Leaky Resonances: Role of Substrate and Roughness
Z. F. Sadrieva,Ivan S. Sinev,Kirill Koshelev,Anton Samusev,Ivan Iorsh,Osamu Takayama,Radu Malureanu,Andrey Bogdanov,Andrei V. Lavrinenko +8 more
TL;DR: In this paper, the authors analyzed the properties of optical bound states in the continuum (BIC) in CMOS-compatible one-dimensional photonic structure based on silicon-on-insulator wafer at telecommunication wavelengths, where the absorption of silicon is negligible.