Silicon photonic crystal heterojunctions based dual-band unidirectional transmission with high transmissivity
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Silicon photonic crystal heterojunctions based dual‑band unidirectional transmission with high transmissivity Dan Liu1,2 · Sen Hu1,2 Received: 10 March 2020 / Accepted: 15 September 2020 / Published online: 23 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Heterojunctions, which consist of two-dimensional circular- and square- hole silicon photonic crystals (PCs), are presented. Based on the finite-different time-domain simulations, the light transmission spectra and field distributions are obtained. A dual-band efficient unidirectional transmission behavior is realized by exciting higher diffraction orders through the novel interface structure. Owing to the self-collimation effect, high-quality unidirectional beam splitting phenomena are also observed. A heterojunction, which can achieve both dual-band unidirectional transmission with high transmissivity of 86.7% and two high-intensity good-directionality split beams, is constructed. Keywords Photonic crystal heterojunction · Unidirectional transmission · Beam splitting · Optical diode
1 Introduction Owing to the capability of unidirectional optical transmission just like electron diodes in circuit (Ye et al. 2016; Liu et al. 2016), optical diodes have great potential applications in integrated optical circuits for all-optical computing and information processing (Li et al. 2017; Zhu et al. 2018; Xu et al. 2020; Feng 2015). Time-reversal or spatial inversion symmetry breaking is the requirement for unidirectional wave propagation. Time-reversal symmetry breaking is usually achieved by using nonlinear materials (Feng and Wang 2013a; Fujii et al. 2006; Fan et al. 2012), magneticoptical materials and so on (Bi et al. 2011; Poo et al. 2011). These schemes all need the external condition (electric field, magnetic field or light field) to realize, and limit the application. In contrast, spatial inversion symmetry breaking could make up for this shortcoming and is widely studied (Feng and Wang 2013a, b; Serebryannikov 2009; Cakmak et al. 2010; Serebryannikov et al. 2012; Li et al. 2011; Lu et al. 2011a, b; Wang et al. 2011; * Dan Liu [email protected] 1
School of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan 430205, China
2
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332‑0250, USA
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Kurt et al. 2012; Fei et al. 2017; Cicek et al. 2012; Yucel et al. 2013; Feng et al. 2011; Cheng et al. 2014; Liu et al. 2017; Zhang et al. 2014; Fei et al. 2018). Serebryannikov and Cakmak studied the light transmission in corrugated-surface PCs, and demonstrated that the propagation direction could be manipulated by the diffraction effects (Serebryannikov 2009; Cakmak et al. 2010; Serebryannikov et al. 2012). Li et al. (2011) reported an acoustic diode based on sonic crystals, which achieved the unidirectional transmission of acoustic waves and provided references for the design of o
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