Continuously tunable microdroplet-laser in a microfluidic channel

Tang, Susan; Derda, Ratmir; Quan, Qimin; Lončar, Marko; Whitesides, George M.

doi:10.1364/oe.19.002204

Cited by 119 publications

(128 citation statements)

References 29 publications

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“…Within the studied range of droplet sizes (7.7-11.0 μm), FSR decreased withλ following an almost linear dependence. A similar spectral shift of the overall lasing gain profile was previously observed in lasing emulsion droplets [6,15] and explained by the size-dependence of the efficiency of light outcoupling from the droplets and the cross section of the lasing WGMs.…”

supporting

confidence: 81%

“…These WGMs are superimposed on a broad nonresonant background emission from the dye-doped thin solution layer formed on the cover glass during the experiment. In general, droplet WGMs can be characterized using radial, azimuthal, and angular mode numbers, and polarization (TE or TM) [6]. The WGMs that belong to the same mode family with identical radial mode number and polarization are indicated in Fig.…”

mentioning

confidence: 99%

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Dye lasing in optically manipulated liquid aerosols

et al. 2013

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Dye lasing in optically manipulated liquid aerosolsKaradag, Y.; Aas, M.; Anand, S.; McGloin, David; Kiraz, A. General rightsCopyright and moral rights for the publications made accessible in Discovery Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from Discovery Research Portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain.• You may freely distribute the URL identifying the publication in the public portal. Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. We report lasing in airborne, rhodamine B-doped glycerol-water droplets with diameters ranging between 7.7 and 11.0 μm, which were localized using optical tweezers. While being trapped near the focal point of an infrared laser, the droplets were pumped with a Q-switched green laser. Our experiments revealed nonlinear dependence of the intensity of the droplet whispering gallery modes (WGMs) on the pump laser fluence, indicating dye lasing. The average wavelength of the lasing WGMs could be tuned between 600 and 630 nm by changing the droplet size. These results may lead to new ways of probing airborne particles, exploiting the high sensitivity of stimulated emission to small perturbations in the droplet laser cavity and the gain medium.

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confidence: 81%

mentioning

confidence: 99%

Dye lasing in optically manipulated liquid aerosols

et al. 2013

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“…The output laser characteristics depend on the composition of the gain medium and can thus be used as probes for the reaction. A number of published reports describe the use of microfabricated lasers, including a microfluidic dye laser [79] and a laser that could be tuned using digital microfluidics [80]. …”

Section: Droplet-based Micro and Nanotechnologymentioning

confidence: 99%

Droplet microfluidics: A tool for biology, chemistry and nanotechnology

Mashaghi

Abbaspourrad

Weitz

et al. 2016

TrAC Trends in Analytical Chemistry

311

188

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The ability to perform laboratory operations on small scales using miniaturized devices provides numerous benefits, including reduced quantities of reagents and waste as well as increased portability and controllability of assays. These operations can involve reaction components in the solution phase and as a result, their miniaturization can be accomplished through microfluidic approaches. One such approach, droplet microfluidics, provides a high-throughput platform for a wide range of assays and approaches in chemistry, biology and nanotechnology. We highlight recent advances in the application of droplet microfluidics in chipbased technologies, such as single-cell analysis tools, small-scale cell cultures, in-droplet chemical synthesis, high-throughput drug screening, and nanodevice fabrication.

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“…This is different for semiconductorbased WGM cavities where tuning of the cavity resonances is achievable by temperature-, field-or carrier-induced changes of the optical properties. [15][16][17][18] Liquid WGM resonators have been tuned by changing the size of the droplet resonators 19 or by mechanical size stretching. [20][21][22] But functional facility and reversibility are difficult to attain.…”

Section: Introductionmentioning

confidence: 99%

Optically controlled elastic microcavities

et al. 2015

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Whispering gallery mode (WGM) resonators made from dielectrics like glass or polymers have outstanding optical properties like huge cavity quality (Q) factors which can be achieved on scales compatible with on-chip integration. However, tunability of these resonances is typically difficult to achieve or not suitable for robust device applications. We report here on the fabrication of polymeric micro-goblet WGM resonators with an optically controlled and stable reversible tunability over a large spectral range. This tunability is achieved by integration of photo-responsive liquid crystalline elastomers (LCEs) into micro-goblet cavities. The optical response of the elastomer allows reshaping the goblet by employing low pump power, leading to a fully reversible tuning of the modes. The structure can be realistically implemented in on-chip devices, combining the ultra-high Q factors, typical of WGM resonators, with reliable, optical tunability. This result serves as an example of how light can control light, by invoking a physical reshaping of the structure. This way of optical tuning creates interesting possibilities for all-optical control in circuits, enabling interaction between signal and control beams and the realization of self-tuning cavities. Keywords: liquid crystal elastomers; polymeric cavities; tunable micro-resonators; whispering gallery modes INTRODUCTION Solid-state optical microcavities are versatile photonic devices which come in a large variety of appearances. 1 Of particular interest are whispering gallery mode (WGM) resonators which feature small modal volume and large quality (Q) factors. 2 They are highly attractive for fundamental physics studies like cavity quantum electrodynamics, 3 as well as for applications like single photon sources, 4 optical sensing 5 or communication technology. 6,7 A key feature of WGM microcavities is the occurrence of ultra-narrow optical resonances and the functionality of the cavity often relies on the shift of the resonance frequency. This is the case, e.g., for optical sensors where the modal shift indicates the presence of attached bio-molecules or a change in the composition of the surrounding medium. 5 Essential features of such resonators are thus a large free spectral range and a narrow linewidth of the resonances but for many applications additionally an active manipulation of the cavity resonances is required. Examples are the tuning of the cavity into resonance with a quantum emitter 8,9 or utilization of the cavity in optical filters and light modulators. 10 In the last decade, a new class of WGM resonators has emerged featuring ultra-high Q factors. These resonators have spherical, cylindrical, toroidal, disk or goblet shapes 1,9,11 and are made of silica, polymers or liquids. Besides their excellent sensing capabilities they can also be turned into micro-lasers when incorporating laser dyes 12 or quantum dots 13 or be coupled to form photonic molecules. 14 But an obstacle effectively hindering some applications of these cavities is the limited tunab...

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Continuously tunable microdroplet-laser in a microfluidic channel

Cited by 119 publications

References 29 publications

Dye lasing in optically manipulated liquid aerosols

Dye lasing in optically manipulated liquid aerosols

Droplet microfluidics: A tool for biology, chemistry and nanotechnology

Optically controlled elastic microcavities

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