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Proceedings Paper

A subwavelength structured multimode interference coupler for the 3-4 micrometers mid-infrared band
Author(s): Alejandro Sánchez-Postigo; Juan Gonzalo Wangüemert-Pérez; Robert Halir; Alejandro Ortega-Moñux; Carlos A. Alonso-Ramos; Íñigo Molina-Fernández; Jordi Soler Penadés; Milos Nedeljkovic; Goran Z. Mashanovich; Pavel Cheben
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Paper 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.

Paper Details

Date Published: 1 May 2015
PDF: 7 pages
Proc. SPIE 9516, Integrated Optics: Physics and Simulations II, 95160L (1 May 2015); doi: 10.1117/12.2179454
Show Author Affiliations
Alejandro Sánchez-Postigo, Univ. de Málaga (Spain)
Juan Gonzalo Wangüemert-Pérez, Univ. de Málaga (Spain)
Robert Halir, Univ. de Málaga (Spain)
Alejandro Ortega-Moñux, Univ. de Málaga (Spain)
Carlos A. Alonso-Ramos, Univ. de Málaga (Spain)
Íñigo Molina-Fernández, Univ. de Málaga (Spain)
Jordi Soler Penadés, Univ. of Southampton (United Kingdom)
Milos Nedeljkovic, Univ. of Southampton (United Kingdom)
Goran Z. Mashanovich, Univ. of Southampton (United Kingdom)
Pavel Cheben, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 9516:
Integrated Optics: Physics and Simulations II
Pavel Cheben; Jiří Čtyroký; Iñigo Molina-Fernández, Editor(s)

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