S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Design and Optimization of Red-light Reflector Using Simulation Software

Junjia Xu, Chang Hong Lin, Yu-Ting Chen, Hsien-Wei Tseng, Peng Wang, Cheng-Fu Yang, and Chiang-Lung Lin

(Received March 23, 2021; Accepted May 31, 2021)

Keywords: simulation, COMSOL Multiphysics, red-light reflector, optimize

The traditional distributed Bragg reflector (DBR), which is constructed with multiperiod films with alternating low and high refractive indices, has a low full width at half maximum (FWHM) but both the ripple number and ripple intensity increase outside the reflectance band. In this study, Ta2O5 and SiO2 films with refractive indices of 2.10 and 1.45 were used as the low- and high-refractive-index films, respectively, to design a traditional red-light DBR with a central wavelength of 7000 nm. First, we used COMSOL Multiphysics as a tool to simulate the designed DBR. Although the designed reflector had a low FWHM value, it had high ripple intensities outside the reflectance band. Therefore, we designed a modified DBR with a structure of 15 layers and with different thicknesses of the upper and bottom layers. The modified DBR had a smaller FWHM, a higher reflectance, and smaller ripple intensities outside the reflectance band. Although the ripple intensities were lower than those of the traditional DBR, they were still higher than 20%. Next, we also used the optimization function of COMSOL Multiphysics to suppress the ripple intensities, and we showed that the ripple intensities were indeed suppressed.

Corresponding author: Cheng-Fu Yang, Chiang-Lung Lin

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