Near infrared and optical beam steering and frequency splitting in air holes-in-silicon inverse photonic crystals

Date
2017-09-28
Authors
Tasolamprou, Anna
Koschny, Thomas
Kafesaki, Maria
Soukoulis, Costas
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Ames Laboratory
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Physics and Astronomy
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Abstract

We present the design of a dielectric inverse photonic crystal structure that couples line-defect waveguide propagating modes into highly directional beams of controllable directionality. The structure utilizes a triangular lattice made of air holes drilled in an infinitely thick Si slab, and it is designed for operation in the near-infrared and optical regime. The structure operation is based on the excitation and manipulation of dark dielectric surface states, in particular on the tailoring of the dark states’ coupling to outgoing radiation. This coupling is achieved with the use of properly designed external corrugations. The structure adapts and matches modes that travel through the photonic crystal and the free space. Moreover it facilitates the steering of the outgoing waves, is found to generate well-defined, spatially and spectrally isolated beams, and may serve as a frequency splitting component designed for operation in the near-infrared regime and in particular the telecom optical wavelength band. The design complies with the state-of-the-art Si nanofabrication technology and can be directly scaled for operation in the optical regime.

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beam steering, dielectric media, directional emission, frequency splitting, photonic crystals, surface states
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