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首页> 外文会议>Conference on Photonic Crystal Materials and Devices Jan 28-30, 2003 San Jose, California, USA >Abnormal propagation and interface refraction of light in a photonic crystal and their applications
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Abnormal propagation and interface refraction of light in a photonic crystal and their applications

机译：光子晶体中光的异常传播和界面折射及其应用

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摘要

We analyze the abnormal refraction and propagation when a light beam of finite and practical width enters a photonic crystal from a uniform medium. The beam propagation in the photonic crystal is very complex, and in many cases, is beyond the realm of refraction (even with a renormalized refractive index given by photonic band calculation). Generally, light propagation is restricted to a triangular region (or a fan), although the light may not fill the whole triangle, nor is the light intensity uniform in the triangle. It is found beam divergence does not have a definite connection with the fan shape of the region of light propagation, in contrast to dynamic X-ray theory. A new origin of the fan shape is suggested. Also simulations indicate that at microscale, a narrow light beam may zigzag in a photonic crystal with sufficiently high index contrast. An application of this phenomenon is to make a wide angle bend for waveguides. The designed bending structure has low loss and matches the mode size of a typical single-mode waveguide for fiber-optic communications. Our simulations are based on two-dimensional photonic crystals.
机译：当有限和实际宽度的光束从均匀介质进入光子晶体时，我们分析了异常折射和传播。光子晶体中的光束传播非常复杂，并且在许多情况下，超出了折射范围（即使具有通过光子带计算得出的归一化折射率）。通常，光传播被限制在三角形区域（或风扇），尽管光可能不会填充整个三角形，也不会在三角形中使光强度均匀。与动态X射线理论相反，发现光束发散与光传播区域的扇形没有明确的联系。建议使用新的风扇形状。模拟还表明，在微尺度上，窄光束可能在具有足够高折射率对比度的光子晶体中呈锯齿形。这种现象的应用是使波导弯曲成广角。设计的弯曲结构损耗低，并且与用于光纤通信的典型单模波导的模式尺寸匹配。我们的模拟基于二维光子晶体。

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