基于光子晶体波导的折射率传感器的灵敏度优化设计
首发时间:2013-09-03
摘要:通过研究波导两侧缺陷处的折射率对二维光子晶体波导透射光谱的影响,提出了一种提高折射率传感器灵敏度的方案。计算结果表明光子带隙上边沿的偏移量与传感区折射率的大小存一定关系,在相同的折射率变化量下通过改变波导两侧缺陷处圆孔的相关几何参数可极大提高光子带隙上边沿的偏移量,即提高折射率传感器的灵敏度。文中通过优化设计,传感器的灵敏度由60nm/RIU提高到570nm/RIU。
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Optimizing design for Sensitivity Improvement of RI Sensors Based on Photonic Crystal Guide
Abstract:The transmission spectrum of a two-dimensional photonic crystal waveguide with edge defects of different refractive index (RI) is studied, and accordingly a proposal to improve the sensitivity of RI sensor is put forward. The simulations and calculations show that the offset of the upper band edge of photonic band gap (PBG) is related to the refractive index of analyte. For same RI variation, the shift of the upper band edge of the PBG can be greatly improved by changing the related geometrical parameters of holes at the defect area near both sides of the waveguide. That is the sensitivity of the RI sensor can be improved. In this paper the sensitivity is improved from 60nm/RIUto 570nm/RIUafter the optimizing process.
Keywords: Photonic crystal waveguide RI sensor Photonic band gap Defect
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