scholarly journals The Measurement of Nanoparticle Concentrations by the Method of Microcavity Mode Broadening Rate

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5950
Author(s):  
Alexey Ivanov ◽  
Kirill Min`kov ◽  
Alexey Samoilenko ◽  
Gennady Levin
Keyword(s):  
Quality Control ◽  
Measurement System ◽  
Ag Nanoparticles ◽  
Interaction Process ◽  
Whispering Gallery Modes ◽  
Control Methods ◽  
Optical Microcavities ◽  
Whispering Gallery ◽  
Collective Interaction ◽  
Novel Method

A measurement system for the detection of a low concentration of nanoparticles based on optical microcavities with whispering-gallery modes (WGMs) is developed and investigated. A novel method based on the WGM broadening allows us to increase the precision of concentration measurements up to 0.005 ppm for nanoparticles of a known size. We describe WGM microcavity manufacturing and quality control methods. The collective interaction process of suspended Ag nanoparticles in a liquid and TiO2 in the air with a microcavity surface is studied.

Energy Transfer and Molecule-Radiation Interaction in Optical Microcavities

2006 ◽  
Author(s):  
Haiyong Quan ◽  
Zhixiong (James) Guo
Keyword(s):  
Energy Transfer ◽  
Molecular Detection ◽  
Laser Energy ◽  
Maximum Energy ◽  
Whispering Gallery Modes ◽  
Optical Microcavities ◽  
Optical Wavelength ◽  
Whispering Gallery ◽  
Microcavity Devices ◽  
And Storage

Laser energy transfer and molecule-radiation interaction in optical microcavity devices are characterized. The device is operated at whispering-gallery modes, and consists of a microcavity and a micro-waveguide coupled by a sub-micrometer air-gap. Emphases are placed on the influences of microcavity size and waveguide compatibility on the energy transfer and storage capability, on the interactions of foreign molecules with the evanescent radiation field surrounding a resonant microcavity. An optimal gap is found for the considered device configuration where maximum energy storage is achieved. This optimal gap is dependent on the resonance mode as well as the morphology. The Q factor increases exponentially with increasing gap and saturates as the gap approaches the optical wavelength. The influence of molecules attachment is demonstrated and the potential in molecular detection is discussed.

Analytical Solution of Whispering-Gallery Modes

2007 ◽  
Author(s):  
Haiyong Quan ◽  
Zhixiong Guo
Keyword(s):  
Separation Of Variables ◽  
Whispering Gallery Modes ◽  
Mems Devices ◽  
High Q ◽  
Optical Microcavities ◽  
Whispering Gallery ◽  
Resonant Modes ◽  
Resonance Frequencies ◽  
Potential Applications ◽  
Dynamic Filters

Advances in MEMS/NEMS techniques have enabled high-Q whispering-gallery modes in integrated microcavities. Potential applications of optical microcavities include quantum informatics, novel micro/nano sources, dynamic filters, and micro/nanosensors. It is important to understand the intrinsic resonant modes of a cavity. In this report, we will analyze whispering-gallery modes in resonators of planar structure which is common in MEMS devices. The wave equation is solved by using the method of separation of variables with appropriate boundary conditions. Analytical formulations are established. The resonance frequencies as well as the electric field distributions in exemplary resonators are presented for a variety of whispering-gallery modes.

scholarly journals GaN microwires as optical microcavities: whispering gallery modes Vs Fabry-Perot modes

2012 ◽  
Vol 20 (17) ◽  
pp. 18707 ◽  
Author(s):  
Pierre-Marie Coulon ◽  
Maxime Hugues ◽  
Blandine Alloing ◽  
Emmanuel Beraudo ◽  
Mathieu Leroux ◽  
...  
Keyword(s):  
Whispering Gallery Modes ◽  
Optical Microcavities ◽  
Whispering Gallery ◽  
Fabry Perot

Demodulation Method of Distributed Fiber Bragg Grating Sensor Based on Whispering Gallery Mode Optical Microcavities

2012 ◽  
Vol 214 ◽  
pp. 92-96
Author(s):  
Zheng Fang ◽  
Wei Cen Wu ◽  
Bao Jin Peng ◽  
Fei Xu ◽  
Jian Cheng Wu Zhu ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Action Spectrum ◽  
Whispering Gallery Mode ◽  
Whispering Gallery Modes ◽  
Bragg Grating ◽  
Laboratory System ◽  
Central Wavelength ◽  
Optical Microcavities ◽  
Whispering Gallery ◽  
Bragg Grating Sensor

A new system on demodulation of distributed fiber Bragg grating (FBG) sensor is built which is based on Whispering Gallery Modes Optical Microcavities. In order to eliminate the temperature effect on strian measurement two adjacent FBGs (one for sensing, the other for reference) with similar central wavelength and different lengths as a probe by parallel connection are utilized. Studies have shown that the Whispering Gallery Mode Optical Microcavities with special properties of selecting specific light, when the light couple into the cavity and shocking back and forth, only the specific light can couple out, it can be expressed as: 2πrn = kλ, where r is the cavity radius, n is the refractive index of the cavity, λ is the wavelength of the light coupled out, k is taken a positive integer. Using the fature of Whispering Gallery Modes Optical Microcavities to demodulate the spectral signal of the sensing probe, Combined with the light detector, signal amplifiers, computers and other devices to dispaly the detected strain in real time. Experiment result shows that it is feasible to demodulate action spectrum and the cross of FBG for temperature and the strain is solved. It is testified that the initial establishment of the laboratory system is stable, reliable, and less expensive.

High-Q whispering gallery modes in pillar microcavities

2007 ◽  
Vol 32 (2-3) ◽  
pp. 123-126
Author(s):  
Y.-R. Nowicki-Bringuier ◽  
J. Claudon ◽  
C. Böckler ◽  
S. Reitzenstein ◽  
M. Kamp ◽  
...  
Keyword(s):  
Whispering Gallery Modes ◽  
High Q ◽  
Whispering Gallery

Size-dependent whispering gallery modes in Au-coated ZnO microrods

2021 ◽  
Author(s):  
F. Bellarmine ◽  
Senthil Kumar Eswaran ◽  
Ramanjaneyulu Mannam ◽  
M. S. Ramachandra Rao
Keyword(s):  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Size Dependent

On the Abramov approach for the approximation of whispering gallery modes in prolate spheroids

2020 ◽  
pp. 125599
Author(s):  
Pierluigi Amodio ◽  
Anton Arnold ◽  
Tatiana Levitina ◽  
Giuseppina Settanni ◽  
Ewa B. Weinmüller
Keyword(s):  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Prolate Spheroids
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