Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide

Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide

Abstract Coupling between free space components and slab waveguides is a common requirement for integrated optical devices, and is typically achieved by end-fire or grating coupling. Power splitting and distribution requires additional components. Usually grating couplers are used in combination wit...

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Autores principales: Jingxing Shi, Michael E. Pollard, Cesar A. Angeles, Ruiqi Chen, J. C. Gates, M. D. B. Charlton
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2017
Materias:
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Science
Q
Acceso en línea:https://doaj.org/article/ba6090214dfb42879770983878445071
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spelling oai:doaj.org-article:ba6090214dfb428797709838784450712021-12-02T11:52:21ZPhotonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide10.1038/s41598-017-01842-w2045-2322https://doaj.org/article/ba6090214dfb428797709838784450712017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01842-whttps://doaj.org/toc/2045-2322Abstract Coupling between free space components and slab waveguides is a common requirement for integrated optical devices, and is typically achieved by end-fire or grating coupling. Power splitting and distribution requires additional components. Usually grating couplers are used in combination with MMI/Y-splitters to do this task. In this paper, we present a photonic crystal device which performs both tasks simultaneously and is able to couple light at normal incidence and near normal incidence. Our approach is scalable to large channel counts with little impact on device footprint. We demonstrate in normal incidence coupling with multi-channel splitting for 785 nm light. Photonic crystals are etched into single mode low refractive index SiON film on both SiO2/Si and borosilicate glass substrate. Triangular lattices are shown to provide coupling to 6 beams with equal included angle (60°), while a quasi-crystal lattice with 12-fold rotational symmetry yields coupling to 12 beams with equal included angle (30°). We show how to optimize the lattice constant to achieve efficient phase matching between incident and coupled mode wave vectors, and how to adjust operating wavelength from visible to infrared wavelengths.Jingxing ShiMichael E. PollardCesar A. AngelesRuiqi ChenJ. C. GatesM. D. B. CharltonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Jingxing Shi
Michael E. Pollard
Cesar A. Angeles
Ruiqi Chen
J. C. Gates
M. D. B. Charlton
Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
description Abstract Coupling between free space components and slab waveguides is a common requirement for integrated optical devices, and is typically achieved by end-fire or grating coupling. Power splitting and distribution requires additional components. Usually grating couplers are used in combination with MMI/Y-splitters to do this task. In this paper, we present a photonic crystal device which performs both tasks simultaneously and is able to couple light at normal incidence and near normal incidence. Our approach is scalable to large channel counts with little impact on device footprint. We demonstrate in normal incidence coupling with multi-channel splitting for 785 nm light. Photonic crystals are etched into single mode low refractive index SiON film on both SiO2/Si and borosilicate glass substrate. Triangular lattices are shown to provide coupling to 6 beams with equal included angle (60°), while a quasi-crystal lattice with 12-fold rotational symmetry yields coupling to 12 beams with equal included angle (30°). We show how to optimize the lattice constant to achieve efficient phase matching between incident and coupled mode wave vectors, and how to adjust operating wavelength from visible to infrared wavelengths.
format article
author Jingxing Shi
Michael E. Pollard
Cesar A. Angeles
Ruiqi Chen
J. C. Gates
M. D. B. Charlton
author_facet Jingxing Shi
Michael E. Pollard
Cesar A. Angeles
Ruiqi Chen
J. C. Gates
M. D. B. Charlton
author_sort Jingxing Shi
title Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
title_short Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
title_full Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
title_fullStr Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
title_full_unstemmed Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
title_sort photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
publisher Nature Portfolio
publishDate 2017
url https://doaj.org/article/ba6090214dfb42879770983878445071
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AT michaelepollard photoniccrystalandquasicrystalsprovidingsimultaneouslightcouplingandbeamsplittingwithinalowrefractiveindexslabwaveguide
AT cesaraangeles photoniccrystalandquasicrystalsprovidingsimultaneouslightcouplingandbeamsplittingwithinalowrefractiveindexslabwaveguide
AT ruiqichen photoniccrystalandquasicrystalsprovidingsimultaneouslightcouplingandbeamsplittingwithinalowrefractiveindexslabwaveguide
AT jcgates photoniccrystalandquasicrystalsprovidingsimultaneouslightcouplingandbeamsplittingwithinalowrefractiveindexslabwaveguide
AT mdbcharlton photoniccrystalandquasicrystalsprovidingsimultaneouslightcouplingandbeamsplittingwithinalowrefractiveindexslabwaveguide
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