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Optical Microcavity/Microresonators Sensing Technology

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Prof. Dr. Baicheng Yao

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Guest Editor

School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Interests: Intelligent communication networks and information processing; optical fiber sensing and communication; intelligent sensing and information systems

Dr. Shuijing Tang

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Guest Editor

Institute of physics, Peking University, Beijing 100871, China
Interests: optical biosensing

Prof. Dr. Xiaoqin Shen

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Guest Editor

School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
Interests: ultrahigh quality-factor (Q) microcavities for photonics, nonlinear optics and optoelectronics; exploring nano/micro luminescent materials for biomedical applications;organic luminescent and nonlinear optical materials

Special Issue Information

Dear Colleagues,

Optical microcavities with high time-frequency coherence and energy confinement demonstrate unique high resolvability for optical sensing. Moreover, in combination with new materials and functionalizations, they also show a wide potential for selective detection. Recently, the development of microcavity/microresonator-based sensing technology has spurred advances ranging from physical measurement, biological and chemical tracing, and environmental monitoring. This Issue is addressed to all types of microcavity/microresonator-based optical sensors and systems, from fundamental science to applications.

Prof. Dr. Baicheng Yao
Dr. Shuijing Tang
Prof. Dr. Xiaoqin Shen
Guest Editors

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Research

15 pages, 1383 KiB

Open AccessArticle

Distributed Bragg Reflectors Employed in Sensors and Filters Based on Cavity-Mode Spectral-Domain Resonances

by Michal Gryga, Dalibor Ciprian and Petr Hlubina

Sensors 2022, 22(10), 3627; https://doi.org/10.3390/s22103627 - 10 May 2022

Cited by 7 | Viewed by 3112

Abstract

Spectral-domain resonances for cavities formed by two distributed Bragg reflectors (DBRs) were analyzed theoretically and experimentally. We model the reflectance and transmittance spectra of the cavity at the normal incidence of light when DBRs are represented by a one-dimensional photonic crystal (1DPhC) comprising [...] Read more.

_{2}

/SiO

_{2}

with a termination layer of TiO

_{2}

. Using a new approach based on the reference reflectance, we model the reflectance ratio as a function of both the cavity thickness and its refractive index (RI) and show that narrow dips within the 1DPhC band gap can easily be resolved. We revealed that the sensitivity and figure of merit (FOM) are as high as 610 nm/RIU and 938 RIU

^{- 1}

, respectively. The transmittance spectra include narrow peaks within the 1DPhC band gap and their amplitude and spacing depend on the cavity’s thickness. We experimentally demonstrated the sensitivity to variations of relative humidity (RH) of moist air and FOM as high as 0.156 nm/%RH and 0.047 %RH

^{- 1}

, respectively. In addition, we show that, due to the transmittance spectra, the DBRs with air cavity can be employed as spectral filters, and this is demonstrated for two LED sources for which their spectra are filtered at wavelengths 680 nm and 780 nm, respectively, to widths as narrow as 2.3 nm. The DBR-based resonators, thus, represent an effective alternative to both sensors and optical filters, with advantages including the normal incidence of light and narrow-spectral-width resonances. Full article

(This article belongs to the Special Issue Optical Microcavity/Microresonators Sensing Technology)

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15 pages, 5202 KiB

Open AccessArticle

Cascade Brillouin Lasing in a Tellurite-Glass Microsphere Resonator with Whispering Gallery Modes

by Elena A. Anashkina, Maria P. Marisova, Vitaly V. Dorofeev and Alexey V. Andrianov

Sensors 2022, 22(8), 2866; https://doi.org/10.3390/s22082866 - 8 Apr 2022

Cited by 11 | Viewed by 2443

Abstract

Brillouin microlasers based on microresonators with whispering gallery modes (WGMs) are in high demand for different applications including sensing and biosensing. We fabricated a microsphere resonator with WGMs from a synthesized high-quality tellurite glass with record high Q-factors for tellurite microresonators (Q ≥ 2.5 × 10⁷), a high Brillouin gain coefficient (compared to standard materials, e.g., silica glasses), and a Brillouin frequency shift of 9 ± 0.5 GHz. The high density of excited resonance modes and high loaded Q-factors allowed us to achieve experimentally cascade Stokes-Brillouin lasing up to the 4th order inclusive. The experimental results are supported by the results of the theoretical analysis. We also theoretically obtained the dependences of the output Brillouin powers on the pump power and found the pump-power thresholds for the first five Brillouin orders at different values of pump frequency detuning and Q-factors, and showed a significant effect of these parameters on the processes under consideration. Full article

(This article belongs to the Special Issue Optical Microcavity/Microresonators Sensing Technology)

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