Fabrication and Testing of Microfluidic Optomechanical Oscillators

Han, Kewen; Kim, Kyu Hyun; Kim, Junhwan; Lee, Won Suk; Liu, Jing; Fan, Xudong; Carmon, Tal; Bahl, Gaurav

doi:10.3791/51497

Cited by 11 publications

(11 citation statements)

References 26 publications

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“…The evanescent field of the WGM in the OFRR core interacts with the gain medium (Chla) and provides the optical feedback for lasing 43 . Fabrication of the OFRR have been well documented elsewhere 43-45 . Briefly, a fused silica capillary preform (Polymicro Technologies TSP700850) was first etched with diluted hydrofluoric acid and then rapidly stretched under CO2 laser irradiation.…”

Section: Methodsmentioning

confidence: 99%

Optofluidic chlorophyll lasers

Chen

Fan

2016

Lab Chip

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Chlorophylls are essential for photosynthesis and also one of the most abundant pigments on earth. Using the optofluidic ring resonator of extremely high Q-factors (>107), we investigated unique characteristics and the underlying mechanism of chlorophyll lasers. The chlorophyll lasers with dual lasing bands at 680 nm and 730 nm were observed for the first time in isolated chlorophyll a (Chla). Particularly, laser at the 730 nm band was realized in 0.1 mM Chla with a lasing threshold of only 8 μJ/mm2. Additionally, we observed lasing competition between the two lasing bands. The presence of the laser emission at the 680 nm band can lead to quenching or significant reduction of laser emission at the 730 nm band, effectively increasing the lasing threshold for the 730 nm band. Further concentration dependent studies, along with the theoretical analysis, elucidated the mechanism that determines when and why the laser emission band appears at one of the two bands, or concomitantly at both bands. Finally, Chla was exploited as the donor in fluorescence resonance energy transfer to extend the laser emission into the near infrared regime with an unprecedented wavelength shift as large as 380 nm. Our work will open a door to the development of novel biocompatible and biodegradable chlorophyll based lasers for various applications such as miniaturized tunable coherent light sources and in-vitro/in-vivo biosensing. It will also provide important insight into the chlorophyll fluorescence and photosynthesis processes inside plants.

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Section: Methodsmentioning

confidence: 99%

Optofluidic chlorophyll lasers

Chen

Fan

2016

Lab Chip

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“…The small mode volume is due to the high spatial confinement whereas the temporal confinement is related to the quality factor Q of the cavity. WGMR can have different geometries and there are different fabrication techniques suitable for obtaining high Q resonators [4][5][6] Surface tension cavities such as silica microspheres exhibit near atomic scale roughness, which translates in high quality factors.…”

Section: Introductionmentioning

confidence: 99%

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Farnesi

Berneschi

Cosi

et al. 2016

JoVE

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Dielectric microspheres can confine light and sound for a length of time through high quality factor whispering gallery modes (WGM). Glass microspheres can be thought as a store of energy with a huge variety of applications: compact laser sources, highly sensitive biochemical sensors and nonlinear phenomena. A protocol for the fabrication of both the microspheres and coupling system is given. The couplers described here are tapered fibers. Efficient generation of nonlinear phenomena related to third order optical non-linear susceptibility Χ((3)) interactions in triply resonant silica microspheres is presented in this paper. The interactions here reported are: Stimulated Raman Scattering (SRS), and four wave mixing processes comprising Stimulated Anti-stokes Raman Scattering (SARS). A proof of the cavity-enhanced phenomenon is given by the lack of correlation among the pump, signal and idler: a resonant mode has to exist in order to obtain the pair of signal and idler. In the case of hyperparametric oscillations (four wave mixing and stimulated anti-stokes Raman scattering), the modes must fulfill the energy and momentum conservation and, last but not least, have a good spatial overlap.

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“…The fabrication of OMFRs has previously been reported in 18,22 . Briefly, these microcapillary resonators are fabricated from fused silica capillaries (Polymicro Technologies TSP-700850) of 850 μm outer diameter that are adiabatically drawn under laser heating used for softening the material.…”

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confidence: 99%

Invited Article: Real-time sensing of flowing nanoparticles with electro-opto-mechanics

et al. 2016

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High-Q optical resonators allow label-free detection of individual nanoparticles through perturbation of optical signatures but have practical limitations due to reliance on random diffusion to deliver particles to the sensing region. We have recently developed microfluidic optomechanical resonators that allow detection of free-flowing particles in fluid media with near perfect detection efficiency, without requiring labeling, binding, or direct access to the optical mode. Rapid detection of single particles is achieved through a long-range optomechanical interaction that influences the scattered light spectra from the resonator, which can be quantified with postprocessing. Here, we present a hybrid electromechanical-optomechanical technique for substantially increasing the bandwidth of these optomechanofluidic sensors, enabling real-time operation. The presented system demonstrates temporal resolution of better than 20 μs (50,000 events/second) with particle sensing resolution down to 490 nm, operating in the air without any stabilization or environmental control. Our technique significantly enhances the sensing capabilities of high-Q optical resonators into the mechanics domain, and allows extremely high-throughput analysis of large nanoparticle populations.

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Fabrication and Testing of Microfluidic Optomechanical Oscillators

Cited by 11 publications

References 26 publications

Optofluidic chlorophyll lasers

Optofluidic chlorophyll lasers

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Invited Article: Real-time sensing of flowing nanoparticles with electro-opto-mechanics

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