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

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DOIResolve DOI: http://doi.org/10.1117/12.2179454
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TypeArticle
Proceedings titleProceedings of SPIE: The International Society for Optical Engineering
ConferenceIntegrated Optics: Physics and Simulations II, 13 April 2015 through 15 April 2015
ISSN0277-786X
ISBN9781628416374
Volume9516
Article number95160L
SubjectBandwidth; Carbon dioxide; Flexible electronics; Infrared devices; Integrated optics; Molecules; Photonics; Refractive index; Waveguide couplers; Basic building block; Low-cost measurements; MIR; MMI; Multimode interference couplers; Operational bandwidth; SWG; Ultra-broadband; Coupled circuits
AbstractThe 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.
Publication date
PublisherSPIE
LanguageEnglish
AffiliationNational Research Council Canada; Information and Communication Technologies
Peer reviewedYes
NPARC number21276970
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Record identifier58eaa84d-4ea4-4d6a-82b2-fe834fe3bd89
Record created2015-11-10
Record modified2016-05-09
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