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A subwavelength structured multimode interference coupler for the 3-4 micrometers mid-infrared band

A subwavelength structured multimode interference coupler for the 3-4 micrometers mid-infrared band
A subwavelength structured multimode interference coupler for the 3-4 micrometers mid-infrared band
The mid-infrared is attracting increasing attention since many molecules, including potentially hazardous gases such as methane and carbon dioxide, exhibit very specific absorption spectra in this wavelength region. Integrated silicon photonics circuits are envisioned to enable compact and low-cost measurement solutions for these molecules. Multimode interference couplers (MMIs) are basic building blocks for photonic circuits and a broad operational bandwidth is key if flexible operation is to be achieved, e.g. to detect different gases. Here we overcome the bandwidth limitations found in classical MMIs by segmenting the multimode region at a sub-wavelength pitch to engineer its refractive index and dispersion. We achieve less than 0:5 dB imbalance and excess loss in the complete 3 - 4 µm wavelength range. The sub-wavelength MMI not only exhibits nearly threefold improvement in bandwidth, but is also about three times shorter than the conventional device.
0277-786X
Sánchez-Postigo, A.
81499766-b4c1-48ce-8143-9bdd49621d81
Wangüemert-Pérez, J.G.
7cb1c0f7-6fb7-4fc7-a79e-4f82440c3359
Halir, R.
e3f8d90b-0067-4e1a-a6b1-0217c342dd55
Ortega-Moñux, A.
1ddc0007-ad93-424f-909e-1891ebd4973e
Alonso-Ramos, C.A.
81ef371b-5744-490d-bdf3-5c840a996901
Molina-Fernández, Í.
fd04bfcf-00e3-4bb1-b0f6-1b411811f587
Soler Penadés, J.
f18f3619-0d71-4547-95fd-dd38c37b7adb
Nedeljković, M.
b64e21c2-1b95-479d-a35c-3456dff8c796
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Cheben, P.
9a2e25a5-6aa0-414e-a061-23416efedebc
Sánchez-Postigo, A.
81499766-b4c1-48ce-8143-9bdd49621d81
Wangüemert-Pérez, J.G.
7cb1c0f7-6fb7-4fc7-a79e-4f82440c3359
Halir, R.
e3f8d90b-0067-4e1a-a6b1-0217c342dd55
Ortega-Moñux, A.
1ddc0007-ad93-424f-909e-1891ebd4973e
Alonso-Ramos, C.A.
81ef371b-5744-490d-bdf3-5c840a996901
Molina-Fernández, Í.
fd04bfcf-00e3-4bb1-b0f6-1b411811f587
Soler Penadés, J.
f18f3619-0d71-4547-95fd-dd38c37b7adb
Nedeljković, M.
b64e21c2-1b95-479d-a35c-3456dff8c796
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Cheben, P.
9a2e25a5-6aa0-414e-a061-23416efedebc

Sánchez-Postigo, A., Wangüemert-Pérez, J.G., Halir, R., Ortega-Moñux, A., Alonso-Ramos, C.A., Molina-Fernández, Í., Soler Penadés, J., Nedeljković, M., Mashanovich, G.Z. and Cheben, P. (2015) A subwavelength structured multimode interference coupler for the 3-4 micrometers mid-infrared band. Proceedings of SPIE, 9516. (doi:10.1117/12.2179454).

Record type: Article

Abstract

The mid-infrared is attracting increasing attention since many molecules, including potentially hazardous gases such as methane and carbon dioxide, exhibit very specific absorption spectra in this wavelength region. Integrated silicon photonics circuits are envisioned to enable compact and low-cost measurement solutions for these molecules. Multimode interference couplers (MMIs) are basic building blocks for photonic circuits and a broad operational bandwidth is key if flexible operation is to be achieved, e.g. to detect different gases. Here we overcome the bandwidth limitations found in classical MMIs by segmenting the multimode region at a sub-wavelength pitch to engineer its refractive index and dispersion. We achieve less than 0:5 dB imbalance and excess loss in the complete 3 - 4 µm wavelength range. The sub-wavelength MMI not only exhibits nearly threefold improvement in bandwidth, but is also about three times shorter than the conventional device.

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More information

Published date: 2015
Venue - Dates: Optics + Optoelectronics Conference 2015: SPIE 9516, , Prague, Czech Republic, 2015-04-13 - 2015-04-16

Identifiers

Local EPrints ID: 442674
URI: http://eprints.soton.ac.uk/id/eprint/442674
ISSN: 0277-786X
PURE UUID: 81edec76-6c03-434e-b15d-e87e93f0c176
ORCID for J. Soler Penadés: ORCID iD orcid.org/0000-0002-1706-8533
ORCID for M. Nedeljković: ORCID iD orcid.org/0000-0002-9170-7911

Catalogue record

Date deposited: 23 Jul 2020 16:30
Last modified: 10 Jan 2022 03:02

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Contributors

Author: A. Sánchez-Postigo
Author: J.G. Wangüemert-Pérez
Author: R. Halir
Author: A. Ortega-Moñux
Author: C.A. Alonso-Ramos
Author: Í. Molina-Fernández
Author: J. Soler Penadés ORCID iD
Author: M. Nedeljković ORCID iD
Author: P. Cheben

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