scholarly journals A Vibrometer Based on Magnetorheological Optical Resonators

Vibration ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 239-249 ◽  
Author(s):  
Edoardo Rubino ◽  
Tindaro Ioppolo
Keyword(s):  
Permanent Magnet ◽  
Quality Factor ◽  
Polyvinyl Chloride ◽  
Optical Quality ◽  
Optical Resonator ◽  
Experimental Results ◽  
Whispering Gallery Modes ◽  
Moving Surface ◽  
Whispering Gallery ◽  
Optical Modes

This paper addresses the feasibility of an optical vibrometer that is based on the shift of the optical modes, also known as whispering gallery modes (WGMs), of a magnetorheological optical resonator. The optical resonator that is used in this study is fabricated by mixing polyvinyl chloride plastisol with magnetically polarizable particles. When a permanent magnet that is located nearby the optical resonator is moved, it induces a perturbation of the morphology of the resonator, due to the magnetostrictive effect. This change in the morphology induces a shift in the optical modes of the resonator. The shift of the optical modes can be related to the displacement of the permanent magnet. The proposed sensor concept is based on monitoring the displacement of a tiny magnet that is attached to a moving surface. The optical quality factor of the resonator used in these studies was of the order of 106. The experimental results show a sensitivity of 0.32 pm/μm and a resolution that is less than 300 nm.

scholarly journals Liquid Droplet Microresonators

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 473 ◽  
Author(s):  
Antonio Giorgini ◽  
Saverio Avino ◽  
Pietro Malara ◽  
Paolo De Natale ◽  
Gianluca Gagliardi
Keyword(s):  
Acoustic Waves ◽  
Near Infrared ◽  
Liquid Droplet ◽  
Scattered Light ◽  
Surface Acoustic Waves ◽  
Optical Quality ◽  
Whispering Gallery Modes ◽  
New Paradigm ◽  
Frequency Locking ◽  
Whispering Gallery

We provide here an overview of passive optical micro-cavities made of droplets in the liquid phase. We focus on resonators that are naturally created and suspended under gravity thanks to interfacial forces, illustrating simple ways to excite whispering-gallery modes in various slow-evaporation liquids using free-space optics. Similar to solid resonators, frequency locking of near-infrared and visible lasers to resonant modes is performed exploiting either phase-sensitive detection of the leakage cavity field or multiple interference between whispering-gallery modes in the scattered light. As opposed to conventional micro-cavity sensors, each droplet acts simultaneously as the sensor and the sample, whereby the internal light can detect dissolved compounds and particles. Optical quality factors up to 107–108 are observed in liquid-polymer droplets through photon lifetime measurements. First attempts in using single water droplets are also reported. These achievements point out their huge potential for direct spectroscopy and bio-chemical sensing in liquid environments. Finally, the first experiments of cavity optomechanics with surface acoustic waves in nanolitre droplets are presented. The possibility to perform studies of viscous-elastic properties points to a new paradigm: a droplet device as an opto-fluid-mechanics laboratory on table-top scale under controlled environmental conditions.

Accurately calculating high quality factor of whispering-gallery modes with boundary element method

2009 ◽  
Vol 26 (11) ◽  
pp. 2050 ◽  
Author(s):  
Chang-Ling Zou ◽  
Yong Yang ◽  
Yun-Feng Xiao ◽  
Chun-Hua Dong ◽  
Zheng-Fu Han ◽  
...  
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Quality Factor ◽  
High Quality Factor ◽  
Whispering Gallery Modes ◽  
High Quality ◽  
Whispering Gallery ◽  
Element Method

3C-SiC Microdisks for Visible Photonics

2016 ◽  
Vol 858 ◽  
pp. 711-714
Author(s):  
Marina Radulaski ◽  
Thomas Babinec ◽  
Jing Yuan Linda Zhang ◽  
Sonia Buckley ◽  
Yousif Kelaita ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Quality Factor ◽  
Harmonic Generation ◽  
Room Temperature ◽  
Second Harmonic ◽  
Whispering Gallery Modes ◽  
High Quality ◽  
Whispering Gallery ◽  
Visible Wavelengths ◽  
Sic Film

We fabricated and characterized record small microdisk resonators in thin (210 nm) 3C-SiC film grown on Si (100) substrate. It was found to support high quality factor whispering gallery modes at visible wavelengths. We demonstrated room temperature coupling of these modes to the intrinsic photoluminescence of 3C-SiC at room temperatures and identified their polarization. Finally, we discussed applications for quasi-phasematched second harmonic generation from infrared visible wavelengths.

Quality-factor and nonlinear properties of optical whispering-gallery modes

1989 ◽  
Vol 137 (7-8) ◽  
pp. 393-397 ◽  
Author(s):  
V.B. Braginsky ◽  
M.L. Gorodetsky ◽  
V.S. Ilchenko
Keyword(s):  
Quality Factor ◽  
Whispering Gallery Modes ◽  
Nonlinear Properties ◽  
Whispering Gallery

scholarly journals Towards Exciton-Polaritons in an Individual MoS2 Nanotube

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 373 ◽  
Author(s):  
Dmitrii Kazanov ◽  
Maxim Rakhlin ◽  
Alexander Poshakinskiy ◽  
Tatiana Shubina
Keyword(s):  
Low Temperature ◽  
Whispering Gallery Modes ◽  
Photoluminescence Spectra ◽  
Exciton Resonance ◽  
High Quality ◽  
Energy Fluctuation ◽  
Rabi Splitting ◽  
Whispering Gallery ◽  
Exciton Polaritons ◽  
Optical Modes

We measure low-temperature micro-photoluminescence spectra along a MoS 2 nanotube, which exhibit the peaks of the optical whispering gallery modes below the exciton resonance. The energy fluctuation and width of these peaks are determined by the changes of the nanotube wall thickness and propagation of the optical modes along the nanotube axis, respectively. We demonstrate the potential of the high-quality nanotubes for realization of the strong coupling between exciton and optical modes when the Rabi splitting can reach 400 meV. We show how the formation of exciton-polaritons in such structures will be manifested in the micro-photoluminescence spectra and analyze the conditions needed to realize that.

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