Single air-mode resonance photonic crystal nanofiber cavity for ultra-high sensitivity refractive index sensing

We propose a design of series-connected one-dimensional photonic crystal nanofiber cavity sensor (1-D PC-NCS) and one-dimensional photonic crystal nanofiber bandgap filter (1-D PC-NBF). The proposed structure can get a single air mode for refractive index sensing with its extinction ratio of 58.64 dB. It filters out the high order mode and reduces the interaction between signals. By 3D FDTD, the calculated sensitivity is 848.18 nm/RIU (RIU – refractive index unit). Compared with general silicon on-chip nanobeam cavity, the sensitivity is increased by eight times. The additional 1-D PC-NBF will not change the sensitivity and the position of the resonance wavelength. Therefore, the new design we propose addresses the issue of crosstalk, and can be applied to ultra-high sensitivity index-based gas sensing and biosensing without the need for complicated coupling systems.

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High Q one-dimensional photonic crystal slot nanobeam cavity for high-sensitivity refractive index sensing

2015 Opto-Electronics and Communications Conference (OECC) ◽

10.1109/oecc.2015.7340282 ◽

2015 ◽

Author(s):

Tingyu Li ◽

Zhenguo Wang ◽

Dingshan Gao ◽

Xinliang Zhang

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

High Sensitivity ◽

One Dimensional ◽

Dimensional Photonic Crystal ◽

High Q ◽

Refractive Index Sensing

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Excitation of Bloch surface wave on tapered fiber coated with one-dimensional photonic crystal for refractive index sensing

Optics Express ◽

10.1364/oe.25.009019 ◽

2017 ◽

Vol 25 (8) ◽

pp. 9019 ◽

Cited By ~ 15

Author(s):

Tianyu Tu ◽

Fufei Pang ◽

Shan Zhu ◽

Jiajing Cheng ◽

Huanhuan Liu ◽

...

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Surface Wave ◽

One Dimensional ◽

Tapered Fiber ◽

Dimensional Photonic Crystal ◽

Refractive Index Sensing ◽

Bloch Surface Wave

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Refractive index sensing of gases based on a one-dimensional photonic crystal nanocavity

Journal of Sensors and Sensor Systems ◽

10.5194/jsss-4-209-2015 ◽

2015 ◽

Vol 4 (1) ◽

pp. 209-215 ◽

Cited By ~ 9

Author(s):

M. Mohebbi

Keyword(s):

Refractive Index ◽

Photonic Crystal ◽

Optical Sensor ◽

Wavelength Region ◽

High Sensitivity ◽

Optical Resonance ◽

One Dimensional ◽

Refractive Index Sensing ◽

Sensing Applications ◽

Silicon Photonic

Abstract. Silicon photonic crystal sensors have become very attractive for various optical sensing applications. Using silicon as a material platform provides the ability to fabricate sensors with other photonic devices on a single chip. In this paper, a new optical sensor based on optical resonance in a one-dimensional silicon photonic crystal with an air defect is theoretically studied for refractive index sensing in the infrared wavelength region. The air defect introduces a cavity into the photonic crystal, making it suitable for probing the properties of a gas found within the cavity. This photonic crystal nanocavity is designed to oscillate at a single mode with a high quality factor, allowing for refractive index sensing of gases with a high sensitivity. A method is presented to maximize the sensitivity of the sensor and to obtain a very narrow bandwidth cavity mode for good sensor resolution. We change the thickness of the air layers linearly in the photonic crystals on both sides of the nanocavity and show that a sensitivity of 1200 nm RIU−1 can be achieved. We present a detailed analysis of the sensor and variations of the layer thicknesses, the cavity length, and the number of periodic layers in the photonic crystal are investigated. This optical sensor has a much simpler design and higher sensitivity compared to other photonic crystal sensors reported previously.

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