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Subwavelength Silicon Photonics

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Silicon Photonics IV

Part of the book series: Topics in Applied Physics ((TAP,volume 139))

Abstract

Subwavelength gratings refer to periodic structures that have a period less than half the wavelength of light in the material so that no Bragg diffraction mode is supported. Instead, the light will propagate as if it was in a homogeneous material with anisotropic refractive indices. Subwavelength gratings have attracted great interest recently, as they provide a useful degree of freedom for the crafting of the effective refractive index of the material in photonic devices. In this chapter, we will introduce some of the applications of subwavelength structures for silicon photonics devices. We start by introducing the background theory of subwavelength gratings and then discuss their applications for the engineering of waveguide grating couplers, suspended membrane devices for mid-infrared (mid-IR) wavelengths, and their use with numerical optimization techniques for optimizing photonic devices. We shall discuss the classic effective medium theory (EMT) for subwavelength gratings and show how EMT can reduce time-consuming three-dimensional (3D) numerical optimizations to an effective two-dimensional (2D) optimization problem.

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Authors and Affiliations

  1. Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin NT, Hong Kong SAR, People’s Republic of China

    Hon Ki Tsang & Yeyu Tong

  2. Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK

    Xia Chen

  3. School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China

    Zhenzhou Cheng

  4. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK

    Wen Zhou

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  1. Hon Ki Tsang
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Correspondence to Hon Ki Tsang .

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Editors and Affiliations

  1. National Research Council of Canada, Metrology Research Centre, Ottawa, ON, Canada

    David J. Lockwood

  2. Department of Physics, University of Trento, Povo, Italy

    Lorenzo Pavesi

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Tsang, H.K., Chen, X., Cheng, Z., Zhou, W., Tong, Y. (2021). Subwavelength Silicon Photonics. In: Lockwood, D.J., Pavesi, L. (eds) Silicon Photonics IV. Topics in Applied Physics, vol 139. Springer, Cham. https://doi.org/10.1007/978-3-030-68222-4_6

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