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Ultra-sharp asymmetric Fano-like resonance spectrum on Si photonic platform

Ultra-sharp asymmetric Fano-like resonance spectrum on Si photonic platform
Ultra-sharp asymmetric Fano-like resonance spectrum on Si photonic platform

In this paper, we report the generation of an ultra-sharp asymmetric resonance spectrum through Fano-like interference. This generation is accomplished by weakly coupling a high-quality factor (Q factor) Fabry–Pérot (FP) cavity and a low-Q factor FP cavity through evanescent waves. The high-Q FP cavity is formed by Sagnac loop mirrors, whilst the low-Q one is built by partially transmitting Sagnac loop reflectors. The working principle has been analytically established and numerically modelled by using temporal coupled-mode-theory (CMT), and verified using a prototype device fabricated on the 340 nm silicon-on-insulator (SOI) platform, patterned by deep ultraviolet (DUV) lithography. Pronounced asymmetric resonances with slopes up to 0.77 dB/pm have been successfully measured, which, to the best of our knowledge, is higher than the results reported in state-of-the-art devices in on-chip integrated Si photonic studies. The established theoretical analysis method can provide excellent design guidelines for devices with Fano-like resonances. The design principle can be applied to ultra-sensitive sensing, ultra-high extinction ratio switching, and more applications.

1094-4087
7365-7372
Du, H.
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Zhang, W.
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Littlejohns, C. G.
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Stankovic, S.
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Yan, X.
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Tran, D. T.
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Sharp, G. J.
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Gardes, F. Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Thomson, D. J.
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Sorel, M.
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Mashanovich, G. Z.
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Reed, G. T.
ca08dd60-c072-4d7d-b254-75714d570139
Du, H.
f68d2391-e6fb-4fbc-bbe0-86ce9a871352
Zhang, W.
1a783f97-c5ac-49e9-a5a0-49b8b2efab36
Littlejohns, C. G.
0fd6585d-030d-4d8f-a411-6fc03e083efa
Stankovic, S.
13e8c464-b876-405a-b442-7c437a6eafd3
Yan, X.
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Tran, D. T.
6de809a8-3890-4b2a-b546-55302bf0aba4
Sharp, G. J.
1823291b-83b4-4d19-b927-e604bac46995
Gardes, F. Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Thomson, D. J.
17c1626c-2422-42c6-98e0-586ae220bcda
Sorel, M.
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Mashanovich, G. Z.
c806e262-af80-4836-b96f-319425060051
Reed, G. T.
ca08dd60-c072-4d7d-b254-75714d570139

Du, H., Zhang, W., Littlejohns, C. G., Stankovic, S., Yan, X., Tran, D. T., Sharp, G. J., Gardes, F. Y., Thomson, D. J., Sorel, M., Mashanovich, G. Z. and Reed, G. T. (2019) Ultra-sharp asymmetric Fano-like resonance spectrum on Si photonic platform. Optics Express, 27 (5), 7365-7372. (doi:10.1364/OE.27.007365).

Record type: Article

Abstract

In this paper, we report the generation of an ultra-sharp asymmetric resonance spectrum through Fano-like interference. This generation is accomplished by weakly coupling a high-quality factor (Q factor) Fabry–Pérot (FP) cavity and a low-Q factor FP cavity through evanescent waves. The high-Q FP cavity is formed by Sagnac loop mirrors, whilst the low-Q one is built by partially transmitting Sagnac loop reflectors. The working principle has been analytically established and numerically modelled by using temporal coupled-mode-theory (CMT), and verified using a prototype device fabricated on the 340 nm silicon-on-insulator (SOI) platform, patterned by deep ultraviolet (DUV) lithography. Pronounced asymmetric resonances with slopes up to 0.77 dB/pm have been successfully measured, which, to the best of our knowledge, is higher than the results reported in state-of-the-art devices in on-chip integrated Si photonic studies. The established theoretical analysis method can provide excellent design guidelines for devices with Fano-like resonances. The design principle can be applied to ultra-sensitive sensing, ultra-high extinction ratio switching, and more applications.

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Accepted/In Press date: 9 February 2019
e-pub ahead of print date: 27 February 2019

Identifiers

Local EPrints ID: 430053
URI: https://eprints.soton.ac.uk/id/eprint/430053
ISSN: 1094-4087
PURE UUID: b3c9a813-1d36-4eeb-bbcd-468c12f338d5
ORCID for S. Stankovic: ORCID iD orcid.org/0000-0001-6154-3138

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Date deposited: 11 Apr 2019 16:30
Last modified: 11 Apr 2019 16:30

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Contributors

Author: H. Du
Author: W. Zhang
Author: C. G. Littlejohns
Author: S. Stankovic ORCID iD
Author: X. Yan
Author: D. T. Tran
Author: G. J. Sharp
Author: F. Y. Gardes
Author: D. J. Thomson
Author: M. Sorel
Author: G. T. Reed

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