High sensitive optofluidic sensor array based on ring-shaped holes photonic crystal H0-cavity

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• 作者：Safia Arafa ; ^{arafa.safia@gmail.com} ; Mohamed Bouchemat ; Touraya Bouchemat ; Ahlem Benmerkhi
• 关键词：Photonic crystal cavity ; Integrated sensors array ; Finite-difference time domain ; Sensitivity ; Quality factor ; Crosstalk
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：131
• 期：Complete
• 页码：49-57
• 全文大小：2085 K
• 卷排序：131

文摘

The main objective of this work is to investigate a high sensitive optofluidic photonic crystal sensor. The proposed structure consists of ring-shaped holes H0-cavity coupled with two waveguides. We demonstrated that the use of the ring-shaped holes configuration provides an excellent optical confinement within the cavity region, which enhances the sensor performances. Furthermore, to overcome the single purpose capacity of the sensor, a multichannel optofluidic sensor has been implemented in a branch array structure. Each detection unit was designed for different cavity spacing and different resonant wavelength. Results obtained using finite-difference time-domain (FDTD) simulations, indicate that the response of each sensor unit shifts independently in terms of refractive index variations. Accordingly, a sensitivity of 450 nm/RIU and a crosstalk lower than −43.78 dB have been achieved, while maintaining a quality factor as high as 5.74 × 104. These features make the designed structure a promising platform for performing monolithic integration and high multiplexed label-free detection.