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http://dx.doi.org/10.3807/KJOP.2009.20.4.211

Optical Characteristics of Two-dimensional Silicon Photonic Crystal Slab Structures with Air and Silica Cladding  

Lee, Yoon-Sik (School of Information and Communication Engineering, Sungkyunkwan University)
Han, Jin-Kyu (Sungkyunkwan University Advanced Institute of Nano Technology, Sungkyunkwan University)
Song, Bong-Shik (School of Information and Communication Engineering, Sungkyunkwan University)
Publication Information
Korean Journal of Optics and Photonics / v.20, no.4, 2009 , pp. 211-216 More about this Journal
Abstract
Much research into two-dimensional (2-D) photonic crystal (PC) structures has been conducted for realization of ultrasmall optical integrated circuits. A 2-D silicon (Si) PC slab structure with air cladding (n=1) is one of the representative structures in 2-D PCs. While air-clad Si PC slab structures have good optical characteristics, their suspension in air can lead to mechanical weakness, making integration with some optical devices difficult. In this paper, we propose improving the mechanical robustness of PC structure by developing a 2-D Si PC structure with symmetric silica cladding (n=1.44) and comparing its optical properties to that of the air-clad structure. First, we investigate the optical properties of a 2-D Si PC slab structure with air cladding by using a 3-D finite difference time domain method. We determined that a photonic bandgap of 330 nm and a non-leaky propagating bandwidth of 100 nm in the optical communication range are possible. Next, we investigate the optical properties of 2-D Si PC slab structures with silica cladding. Even though the refractive index of the silica cladding is higher than that of air, we developed a silica-clad structure with good optical properties: a photonic band gap of approximately 230 nm and a non-leaky propagating bandwidth of 90 nm, comparable to that of the air-clad PC structures.
Keywords
Photonic crystal; Photonic band gap; Waveguide; Air; Silica;
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