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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
Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide
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.
2045-2322
Shi, Jingxing
2632e5a1-10ba-4b05-9bec-f86facfcee66
Pollard, Michael E.
c439d195-6e7c-48d7-ab81-a20c72b72632
Angeles, Cesar A.
f42d236b-7a26-4c57-aefc-62bcaf2eebb2
Chen, Ruiqi
a55cc107-e990-4e06-8bef-50a97c2c18f8
Gates, J.C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Charlton, M.D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274
Shi, Jingxing
2632e5a1-10ba-4b05-9bec-f86facfcee66
Pollard, Michael E.
c439d195-6e7c-48d7-ab81-a20c72b72632
Angeles, Cesar A.
f42d236b-7a26-4c57-aefc-62bcaf2eebb2
Chen, Ruiqi
a55cc107-e990-4e06-8bef-50a97c2c18f8
Gates, J.C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Charlton, M.D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274

Shi, Jingxing, Pollard, Michael E., Angeles, Cesar A., Chen, Ruiqi, Gates, J.C. and Charlton, M.D.B. (2017) Photonic crystal and quasi-crystals providing simultaneous light coupling and beam splitting within a low refractive-index slab waveguide. Scientific Reports, 7 (1). (doi:10.1038/s41598-017-01842-w).

Record type: Article

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.

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Accepted/In Press date: 4 April 2017
e-pub ahead of print date: 12 May 2017
Published date: 12 May 2017
Organisations: Optoelectronics Research Centre, Nanoelectronics and Nanotechnology, Electronics & Computer Science

Identifiers

Local EPrints ID: 411221
URI: https://eprints.soton.ac.uk/id/eprint/411221
ISSN: 2045-2322
PURE UUID: 5069fda0-1e1f-4eac-81b4-cb811841f686
ORCID for J.C. Gates: ORCID iD orcid.org/0000-0001-8671-5987

Catalogue record

Date deposited: 15 Jun 2017 16:32
Last modified: 10 Dec 2019 01:48

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Contributors

Author: Jingxing Shi
Author: Michael E. Pollard
Author: Cesar A. Angeles
Author: Ruiqi Chen
Author: J.C. Gates ORCID iD
Author: M.D.B. Charlton

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