Sub-wavelength gratings in silicon photonic devices for mid-infrared spectroscopy and sensing

Abstract

Mid-infrared spectroscopy enabled by silicon photonics has received great interest in recent years as a pathway for a scalable sensing technology. The development of such devices would realise inexpensive and accessible instrumentation for a wide variety of uses over numerous fields. However, not every sensing application is the same; to produce sensors for real-world scenarios, engineers need flexibility in device design but also need to maintain compatibility with scalable fabrication processes. Sub-wavelength gratings can offer a solution to this problem, as they enable the engineering of optical properties using standard fabrication techniques and without requiring new materials. By using sub-wavelength gratings, specific design approaches can be tailored to different applications, such as increasing the interaction of a sensor with an analyte or broadening the bandwidth of an integrated photonic device. Here, we review the development of sub-wavelength grating-based devices for mid-infrared silicon photonics and discuss how they can be exploited for spectroscopic and sensing devices.

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Identifiers

ORCID for Milos Nedeljković: orcid.org/0000-0002-9170-7911

ORCID for Colin Mitchell: orcid.org/0000-0001-9773-8842

ORCID for David J. Rowe: orcid.org/0000-0002-1167-150X

ORCID for Goran Z. Mashanovich: orcid.org/0000-0003-2954-5138

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