Trends in Nano- and Micro-Cavities

by

O'Dae Kwon, Byoungho Lee, Kyungwon An

DOI: 10.2174/97816080523631110101
eISBN: 978-1-60805-236-3, 2011
ISBN: 978-1-60805-109-0



Indexed in: Scopus, EBSCO.

This ebook is a collection of cutting edge articles from the 2009 Workshop on Microcavities and their Applications (WOMA 2009). It giv...[view complete introduction]
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Simulation, optimization, and fabrication of optical micro microresonator based lasers and filters, and coupling to radial or tangential waveguides

- Pp. 267-317 (51)

Yingyan Huang, Xiangyu Li, Fang Ou and Seng-Tiong Ho

Abstract

Microdisk, Microring, Microcylinder, and various curvilinear-shape optical resonators with sizes from submicron to hundreds of microns have become a widely used technology. We refer to them collectively as optical microresonators. These optical microresonators can be used as highly compact tunable optical filters integrated on chip. They can also be used to form wavelength-scale optical cavities for realizing microcavity lasers and various microcavity devices. There are few systematic studies of the limitations of these microresonators. Knowing their limitations is important for various practical applications. We first review the various progresses in these optical microresonators, followed by a discussion of the main factors affecting the cavity Q factor of these microresonators. To understand radiation loss, we show a numerically accurate method to compute the radiation loss using conformal transformation. We discuss how to simulate lasing properties of these optical microresonators by using a multi-level multi-electron Finite-Difference Time-Domain (MLME FDTD) quantum model for the semiconductor medium. We then discuss how to compute radiation loss and scattering loss using a FDTD method based on an active-lasing approach and to compare the results to the conformal transformation results. Lastly, we address the important question of how to optimize output coupling of the lasing light in these optical resonators utilizing either a conventional tangential waveguide coupling method or a novel radial waveguide coupling method.

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