Anti-external interference sensor based on cascaded side-coupled photonic crystal nanobeam cavities for simultaneous sensing of the refractive index and temperature

2020 ◽  
Vol 37 (12) ◽  
pp. 3850
Author(s):  
Yongqin Wu ◽  
Fujun Sun ◽  
Shuo Yang ◽  
Zhongyuan Fu ◽  
Chao Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
External Interference ◽  
Nanobeam Cavities ◽  
Simultaneous Sensing

scholarly journals Simultaneous Detection of Relative Humidity and Temperature Based on Silicon On-Chip Cascaded Photonic Crystal Nanobeam Cavities

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1559
Author(s):  
Lun Ye ◽  
Xiao Liu ◽  
Danyang Pei ◽  
Jing Peng ◽  
Shuchang Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Relative Humidity ◽  
Simultaneous Detection ◽  
Silicon On Insulator ◽  
Wavelength Shift ◽  
External Interference ◽  
Lab On Chip ◽  
Resonant Modes ◽  
On Chip ◽  
Nanobeam Cavities

In this paper, we propose and numerically demonstrate a novel cascaded silicon-on-insulator (SOI) photonic crystal nanobeam cavity (PCNC) dual-parameter sensor for the simultaneous detection of relative humidity (RH) and temperature. The structure consists of two independent PCNCs supporting two different resonant modes: a dielectric-mode and an air-mode, respectively. The dielectric-mode nanobeam cavities (cav1) are covered with SU-8 cladding to increase the sensitivity ratio contrast between RH sensing and temperature sensing. The air-mode nanobeam cavities (cav2) are coated with a water-absorbing polyvinyl-alcohol (PVA) layer that converts the change in RH into a change in refractive index (RI) under different ambient RH levels, thereby inducing a wavelength shift. Due to the positive thermo-optic (TO) coefficient of silicon and the negative TO coefficient of SU-8 cladding, the wavelength responses take the form of a red shift for cav2 and a blue shift for cav1 as the ambient temperature increases. By using 3D finite-difference time-domain (3D-FDTD) simulations, we prove the feasibility of simultaneous sensing by monitoring a single output transmission spectrum and applying the sensor matrix. For cav1, the RH and temperature sensitivities are 0 pm/%RH and −37.9 pm/K, while those of cav2 are −389.2 pm/%RH and 58.6 pm/K. The sensitivity ratios of temperature and RH are −1.5 and 0, respectively, which is the reason for designing two different resonant modes and also implies great potential for realizing dual-parameter sensing detection. In particular, it is also noteworthy that we demonstrate the ability of the dual-parameter sensor to resist external interference by using the dual wavelength matrix method. The maximum RH and temperature detection errors caused by the deviation of resonance wavelength 1 pm are only 0.006% RH and 0.026 K, which indicates that it achieves an excellent anti-interference ability. Furthermore, the structure is very compact, occupying only 32 μm × 4 μm (length × width). Hence, the proposed sensor shows promising prospects for compact lab-on-chip integrated sensor arrays and sensing with multiple parameters.

scholarly journals Simultaneous sensing of refractive index and temperature based on a three-cavity-coupling photonic crystal sensor

2019 ◽  
Vol 27 (19) ◽  
pp. 26471 ◽  
Author(s):  
Zheng Wang ◽  
ZhongYuan Fu ◽  
FuJun Sun ◽  
Chao Wang ◽  
Jian Zhou ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Cavity Coupling ◽  
Simultaneous Sensing

On-chip integrated optofluidic complex refractive index sensing using silicon photonic crystal nanobeam cavities

2016 ◽  
Vol 41 (6) ◽  
pp. 1197 ◽  
Author(s):  
Xingwang Zhang ◽  
Guangya Zhou ◽  
Peng Shi ◽  
Han Du ◽  
Tong Lin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Complex Refractive Index ◽  
Refractive Index Sensing ◽  
Silicon Photonic ◽  
On Chip ◽  
Nanobeam Cavities
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