Optical detection of nanoparticles by mode splitting in whispering-gallery-mode microcavities

2010 ◽  
Author(s):  
Jiangang Zhu ◽  
Sahin Kaya Ozdemir ◽  
Lina He ◽  
Da-Ren Chen ◽  
Lan Yang
Keyword(s):  
Optical Detection ◽  
Whispering Gallery Mode ◽  
Whispering Gallery ◽  
Mode Splitting

scholarly journals Mode-Splitting for Refractive Index Sensing in Fluorescent Whispering Gallery Mode Microspheres with Broken Symmetry

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2987 ◽  
Author(s):  
Yvonne Kang ◽  
Alexandre François ◽  
Nicolas Riesen ◽  
Tanya Monro
Keyword(s):  
Refractive Index ◽  
Whispering Gallery Mode ◽  
High Refractive Index ◽  
Refractive Index Sensitivity ◽  
Whispering Gallery ◽  
Mode Splitting ◽  
Surrounding Environment ◽  
Novel Approach ◽  
Surrounding Refractive Index ◽  
Index Sensitivity

Whispering gallery mode (WGM) resonators have become increasingly diverse in terms of both architecture and applications, especially as refractometric sensors, allowing for unprecedented levels of sensitivity. However, like every refractometric sensor, a single WGM resonator cannot distinguish temperature variations from changes in the refractive index of the surrounding environment. Here, we investigate how breaking the symmetry of an otherwise perfect fluorescent microsphere, by covering half of the resonator with a high-refractive-index (RI) glue, might enable discrimination of changes in temperature from variations in the surrounding refractive index. This novel approach takes advantage of the difference of optical pathway experienced by WGMs circulating in different equatorial planes of a single microsphere resonator, which induces mode-splitting. We investigated the influence of the surrounding RI of the microsphere on mode-splitting through an evaluation of the sphere’s WGM spectrum and quality factor (Q-factor). Our results reveal that the magnitude of the mode-splitting increases as the refractive index contrast between the high-refractive-index (RI) glue and the surrounding environment increases, and that when they are equal no mode-splitting can be seen. Investigating the refractive index sensitivity of the individual sub modes resulting from the mode-splitting unveils a new methodology for RI sensing, and enables discrimination between surrounding refractive index changes and temperature changes, although it comes at the cost of an overall reduced refractive index sensitivity.

Observation of whispering-gallery mode splitting in spherical resonator

2007 ◽  
Vol 3 (3) ◽  
pp. 231-233 ◽  
Author(s):  
Guo-ping Lin ◽  
Lei Zhang ◽  
Le Ma ◽  
Ming-hao Sun ◽  
Hui-ying Xu ◽  
...  
Keyword(s):  
Whispering Gallery Mode ◽  
Spherical Resonator ◽  
Whispering Gallery ◽  
Mode Splitting

scholarly journals Interferometric detection of mode splitting for whispering gallery mode biosensors

2010 ◽  
Vol 97 (12) ◽  
pp. 123704 ◽  
Author(s):  
Joachim Knittel ◽  
Terry G. McRae ◽  
Kwan H. Lee ◽  
Warwick P. Bowen
Keyword(s):  
Whispering Gallery Mode ◽  
Whispering Gallery ◽  
Mode Splitting ◽  
Interferometric Detection

Whispering-gallery mode splitting in coupled microresonators

2003 ◽  
Vol 20 (9) ◽  
pp. 1967 ◽  
Author(s):  
David D. Smith ◽  
Hongrok Chang ◽  
Kirk A. Fuller
Keyword(s):  
Whispering Gallery Mode ◽  
Whispering Gallery ◽  
Mode Splitting

scholarly journals The Particle Induced Mode Splitting and Exceptional Points in Whispering-Gallery Mode Microcavity

2020 ◽  
Vol 12 (6) ◽  
pp. 1-14
Author(s):  
Jin Xiao-Xue ◽  
Yong-Pan Gao ◽  
Zheng Shi-Hui ◽  
Tie-Jun Wang ◽  
Chuan Wang
Keyword(s):  
Whispering Gallery Mode ◽  
Exceptional Points ◽  
Whispering Gallery ◽  
Mode Splitting

scholarly journals Analysis of Kerr Noise in Angular-Rate Sensing Based on Mode Splitting in a Whispering-Gallery-Mode Microresonator

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 150 ◽  
Author(s):  
Zhaohua Yang ◽  
Dan Li ◽  
Yuzhe Sun
Keyword(s):  
Noise Suppression ◽  
Angular Rate ◽  
Whispering Gallery Mode ◽  
Measured Signal ◽  
Quality Factors ◽  
Whispering Gallery ◽  
Mode Splitting ◽  
Mathematical Expressions ◽  
The Relationship ◽  
Self Reference

Whispering-gallery-mode (WGM) microresonators have shown their potential in high-precision gyroscopes because of their small volume and high-quality factors. However, Kerr noise can always be the limit of accuracy. Angular-rate sensing based on mode splitting treats backscattering as a measured signal, which can induce mode splitting, while it is considered as a main source of noise in conventional resonator optical gyroscopes. Meanwhile, mode splitting also provides superior noise suppression owing to its self-reference scheme. Kerr noise in this scheme has not been defined and solved yet. Here, the mechanism of the Kerr noise in the measurement is analyzed and the mathematical expressions are derived, indicating the relationship between the Kerr noise and the output of the system. The influence caused by Kerr noise on the output is simulated and discussed. Simulations show that the deviation of the splitting caused by Kerr noise is 1.913 × 10−5 Hz at an angular rate of 5 × 106 °/s and the corresponding deviation of the angular rate is 9.26 × 10−9 °/s. It has been proven that angular-rate sensing based on mode splitting offers good suppression of Kerr noise.

Sign in / Sign up

Export Citation Format

Share Document