Analysis of optical resonant cavity composed of nonparallel reflectors
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Analysis of optical resonant cavity composed of nonparallel reflectors Gang Wu1,2 · Yongqing Huang1 · Xiaofeng Duan1 · Kai Liu1 · Huanhuan Wang1 · Gongqing Li1 · Xiaomin Ren1 Received: 1 February 2020 / Accepted: 20 November 2020 / Published online: 24 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We propose and numerically investigate a novel optical resonant cavity composed of nonparallel reflectors. The top reflector employs a ridge-shaped structure and consists of two flat mirrors, which are positioned symmetrically with the same inclined angle, it extends the interaction length between the reflectors and optical field. The total-energy density and optical field distribution are analyzed by means of the finite element method. One of the most important features of the cavity is that light beams can be confined in a smaller region drastically and the geometric loss of the cavity is reduced. Results indicate that, compared with the parallel F–P cavity with the same height, width, and material, this optical resonant cavity is characteristic of smaller linewidth, higher quality factor, and smaller mode volume, which can be useful for lasers, photodetectors, and displacement sensing. Keywords Optical resonant cavity · Nonparallel reflectors · Linewidth · Quality factor · Confinement effect
1 Introduction During the past decades, optical resonant cavities are of interest for a wide range of optoelectronic devices and integration, their theories and applications have greatly promoted the development of modern optical technology. Optical resonant cavity is an indispensable part of laser (Maiman 1960), its primary role is to provide optical positive feedback, build up the optical power, impose a well-defined mode structure on the electromagnetic field, and control the oscillating beam. Besides, optical resonant cavities are widely used in photodetector (Du and Sun 2014), filter (Dai et al. 2014), sensor (Wang et al. 2019), optical frequency comb (Kim et al. 2017), light-emitting diode (Lee and Ho 2013), and alloptical switching (Dong et al. 2018). In recent several years, various new structure resonant cavities have become one of the hotspots in the research, such as photonic crystal resonant * Yongqing Huang [email protected] 1
State Key Laboratory of Information Photonics and Optical Communications, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
2
School of Science, Lanzhou University of Technology, Lanzhou 730050, China
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cavity (Zhang et al. 2015), optical-fibers resonant cavity (Warren-Smith et al. 2017), and various types of microcavities (Yang et al. 2009; Katti and Prince 2018). However, it’s still a central challenge for the optical resonant cavity to improve the quality factor and reduce the coupling loss with other optical devices. In this paper, a new optical resonant cavity composed of non-parallel reflectors is proposed. Its structu
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