scholarly journals FDTD Simulation: Simultaneous Measurement of the Refractive Index and the Pressure Using Microdisk Resonator with Two Whispering-Gallery Modes

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3955
Author(s):  
Ping Zhang ◽  
Dongyue He ◽  
Chen Zhang ◽  
Zhiruo Yan

In this paper, an approach to measure both the refractive index (RI) and the pressure simultaneously using two Whispering-Gallery Modes (WGMs) in a microdisk resonator is theoretically proposed. Due to the difference in the energy distribution of the first and second order WGMs, the sensitivity of two modes toward the variation of RI and pressure applied to the device show differences. An RI sensitivity of 29.07 nm/RIU and pressure sensitivity of 0.576 pm/kPa for WGM (1,36), and an RI sensitivity of 38.68 nm/RIU and a pressure sensitivity of 0.589 pm/kPa for WGM (2,28) are obtained through the 3D finite-difference time-domain (3D-FDTD) simulation. Dual parametric sensing can be achieved by solving the second-order inverse sensitivity matrix. Therefore, strain–optical coupling behavior is effectively eliminated. The dual sensing scheme we proposed provides a novel approach to overcome the difficulty of multi-sensing applications based on the flexible photonic device.

2018 ◽  
Vol 36 (9) ◽  
pp. 1775-1781 ◽  
Author(s):  
Zhi-Hong Zhang ◽  
Si-Hui Shang ◽  
Mu-Neng Li ◽  
Shao-Yi Wu ◽  
Qin-Sheng Zhu ◽  
...  

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Naoki Okada ◽  
James B. Cole ◽  
Shigeki Yamada ◽  
Kensuke Ogawa ◽  
Yoshifumi Katayama

The finite-difference time-domain (FDTD) algorithm has been used in simulation-based designs of many optical devices, but it fails to reproduce high-Q whispering gallery modes (WGMs). On the other hand, the nonstandard (NS) FDTD algorithm can accurately compute WGMs and can be used to make simulation-based designs of WGM devices. Wavelength splitters using the coupled resonator optical waveguides (CROWs) based on WGM couplings have recently attracted attention because they are potentially ultracompact. In this paper, we design a CROW wavelength splitter using NS FDTD simulations and demonstrate high interchannel extinction ratios of over 20 dB.


2019 ◽  
Vol 58 (16) ◽  
pp. 4400 ◽  
Author(s):  
Siqing Zhang ◽  
Yan Huang ◽  
Yan Liu ◽  
Yao Shao ◽  
Cizhe Fang ◽  
...  

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