scholarly journals FRET-mediated near infrared whispering gallery modes: studies on the relevance of intracavity energy transfer with Q-factors

2018 ◽  
Vol 2 (2) ◽  
pp. 270-274 ◽  
Author(s):  
Osamu Oki ◽  
Soh Kushida ◽  
Annabel Mikosch ◽  
Kota Hatanaka ◽  
Youhei Takeda ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymers ◽  
Near Infrared ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Q Factors ◽  
Wgm Resonators

NIR WGM resonators are fabricated from energy-donating and accepting conjugated polymers.

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.

Whispering-gallery modes in microring lasers made from conjugated polymers

1998 ◽  
Author(s):  
C. Spiegelberg ◽  
A. Schulzgen ◽  
Y. Kawabe ◽  
S. Honkanen ◽  
B. Kippelen ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Whispering Gallery Modes ◽  
Whispering Gallery

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.

scholarly journals Review of biosensing with whispering-gallery mode lasers

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Nikita Toropov ◽  
Gema Cabello ◽  
Mariana P. Serrano ◽  
Rithvik R. Gutha ◽  
Matías Rafti ◽  
...  
Keyword(s):  
Biological Samples ◽  
Whispering Gallery Mode ◽  
Photonic Devices ◽  
Whispering Gallery Modes ◽  
Label Free ◽  
Virus Particles ◽  
Whispering Gallery ◽  
Label Free Detection ◽  
Basic Concepts ◽  
Wgm Resonators

AbstractLasers are the pillars of modern optics and sensing. Microlasers based on whispering-gallery modes (WGMs) are miniature in size and have excellent lasing characteristics suitable for biosensing. WGM lasers have been used for label-free detection of single virus particles, detection of molecular electrostatic changes at biointerfaces, and barcode-type live-cell tagging and tracking. The most recent advances in biosensing with WGM microlasers are described in this review. We cover the basic concepts of WGM resonators, the integration of gain media into various active WGM sensors and devices, and the cutting-edge advances in photonic devices for micro- and nanoprobing of biological samples that can be integrated with WGM lasers.

scholarly journals Nonlinear imaging of whispering gallery modes in GaN microwires

2021 ◽  
Vol 2015 (1) ◽  
pp. 012015
Author(s):  
Yury Berdnikov ◽  
Igor Shtrom ◽  
Maria Rozhavskaya ◽  
Wsevolod Lundin ◽  
Nicholas Hendricks ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
Nonlinear Optical ◽  
Near Infrared ◽  
Whispering Gallery Modes ◽  
Far Field ◽  
Green Luminescence ◽  
Nonlinear Optical Microscopy ◽  
Whispering Gallery ◽  
Infrared Excitation ◽  
Nonlinear Imaging

Abstract In this work non-scanning far-field nonlinear optical microscopy is employed to study the whispering gallery modes in tapered GaN microwire resonators. We demonstrate the confinement of whispering gallery modes under near-infrared excitation with the photon energy close to half of GaN bandgap. Our results indicate the enhancement of yellow-green luminescence by whispering gallery modes in GaN microwires.

Whispering gallery modes enhance the near-infrared photoresponse of hourglass-shaped silicon nanowire photodiodes

2019 ◽  
Vol 2 (12) ◽  
pp. 572-579 ◽  
Author(s):  
Kihyun Kim ◽  
Sol Yoon ◽  
Myunghae Seo ◽  
Seungho Lee ◽  
Hyeonsu Cho ◽  
...  
Keyword(s):  
Near Infrared ◽  
Silicon Nanowire ◽  
Whispering Gallery Modes ◽  
Whispering Gallery

Luminescent nanoparticles embedded in TiO2microtube cavities for the activation of whispering-gallery-modes extending from the visible to the near infrared

Nanoscale ◽  
2016 ◽  
Vol 8 (18) ◽  
pp. 9498-9503 ◽  
Author(s):  
Abbas Madani ◽  
Libo Ma ◽  
Shading Miao ◽  
Matthew R. Jorgensen ◽  
Oliver G. Schmidt
Keyword(s):  
Near Infrared ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Luminescent Nanoparticles

Influence of whispering gallery modes (WGMs) on energy transfer

2011 ◽  
Vol 388 (1-3) ◽  
pp. 38-42 ◽  
Author(s):  
Venkata Ramanaiah Dantham ◽  
Prem Ballabh Bisht
Keyword(s):  
Energy Transfer ◽  
Whispering Gallery Modes ◽  
Whispering Gallery
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