Center’s outgoing postdoc Rahul Kumar Gangwar (now an assistant professor at the University of Delhi) has published the work related to sensing on silicon substrates in the journal Frontiers in Physics. This work was partially supported by the National Key Research and Development Program of China (2021YFB2800400), the National Natural Science Foundation of China (62001010) and the Natural Science Foundation of Beijing Municipality (Z210004).
In this paper, a micro-ring resonant cavity sensor based on porous silicon (Si) is proposed for both temperature and cancer cell detection. The porous silicon allows the external material to interact directly with the optical field due to its large internal surface area. The resonance wavelengths in the transmission spectrum of the microring resonator are very sensitive to the changes of the external environment. Based on this characterization this paper presents a detailed analysis of the effect of different parameters on the transmission spectral characteristics by means of a full vector finite element analysis. The maximum sensitivity achieved by optimizing the parameters was 150 pm/°C (over an operating temperature range of 20 ~ 100°C) and the detection sensitivity against tumor cells was 284.0306 nm/RIU.
Abstract: In this article, a microring resonator sensor based on porous silicon is proposed for temperature and cancer cell detection, simultaneously. The porous behavior of silicon with a large internal surface area allows external materials to interact directly with the guided modes. The resonance wavelength in the transmission spectrum of the microring resonator is very sensitive to external environmental properties such as refractive index and temperature. The transmission characteristics of the proposed sensor were numerically determined by full vectorial finite element analysis. The achieved maximum sensitivity of the proposed sensor with optimized parameters was 150 pm/°C for an operational temperature range of 20–100°C and 284.0306 nm/RIU for operational cancer cell detection, respectively. The results presented here suggest the microring resonator sensor can be used in the fields of environment sensing, temperature sensing, chemical sensing, and biosensing.
Link to the paper:
https://www.frontiersin.org/articles/10.3389/fphy.2022.929033/full?utm_source=dlvr.it&utm_medium=twitter
