Cascaded Raman microlaser in air and buffer

Chistiakova, Maria V.; Armani, Andrea M.

doi:10.1364/ol.37.004068

Cited by 33 publications

(16 citation statements)

References 14 publications

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“…Using this experimental scheme, nanoparticles as small as 10 nm were detected. Though all experiments were performed in a dry environment, Raman lasers have been demonstrated in liquid environment, making this an intriguing strategy for future sensor development efforts (137). …”

Section: Alternative Sensing Mechanismsmentioning

confidence: 99%

Applications of Optical Microcavity Resonators in Analytical Chemistry

Wade

Bailey

2016

Annual Rev. Anal. Chem.

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Optical resonator sensors are an emerging class of analytical technologies that use recirculating light confined within a microcavity to sensitively measure the surrounding environment. Bolstered by advances in microfabrication, these devices can be configured for a wide variety of chemical or biomolecular sensing applications. The review begins with a brief description of optical resonator sensor operation followed by discussions regarding sensor design, including different geometries, choices of material systems, methods of sensor interrogation, and new approaches to sensor operation. Throughout, key recent developments are highlighted, including advancements in biosensing and other applications of optical sensors. Alternative sensing mechanisms and hybrid sensing devices are then discussed in terms of their potential for more sensitive and rapid analyses. Brief concluding statements offer our perspective on the future of optical microcavity sensors and their promise as versatile detection elements within analytical chemistry.

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Section: Alternative Sensing Mechanismsmentioning

confidence: 99%

Applications of Optical Microcavity Resonators in Analytical Chemistry

Wade

Bailey

2016

Annual Rev. Anal. Chem.

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“…The effective refractive index represents the refractive index of the complete toroid-coating-air system and can be determined by the following equation 21,26,27 : ( 2 ) To calculate n eff , the refractive index values measured by spectroscopic ellipsometry at 765nm for the silica and coatings were used. The coefficients χ, γ, and δ are the fractions of the optical field in the resonator, film, and air, respectively.…”

Section: Effective Refractive Indexmentioning

confidence: 99%

“…Whispering gallery mode optical cavities have been used in the development of microlaser systems through many different methods, which include utilizing the inherent non-linear characteristics of the cavity or implanting a material within the cavity to serve as the gain material [1][2][3][4][5][6][7][8][9][10][11] . Applications for whispering gallery mode optical resonators range from single virus detection to the creation of frequency combs 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Titanium enhanced Raman microcavity laser

2014

Self Cite

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Due to their long photon lifetimes, ultra high quality factor (Q) silica microcavities form an ideal platform for microlaser development. Previous work verified that these devices exhibit Raman lasing, because the high Q compensates for the low Raman gain of silica. However, only devices with Q>1E8 are able to achieve microwatt thresholds, limiting the application space. One approach for overcoming this barrier is to increase the inherent Raman gain of the material without degrading the optical performance of the device. To address this challenge, we synthesize a series of titanium (Ti) doped silica sol-gels with different concentrations of Ti, including a null. The refractive indices of the coatings are characterized using spectroscopic ellipsometry and increase linearly with the concentration of Ti from 1.44 to 1.51. We apply the sol-gel as a conformal coating on silica toroidal microcavities and characterize the basic cavity properties (Q) and the lasing behavior, including the lasing threshold and the slope efficiency. All measurements are performed in ambient conditions. Although the cavity Q's are modest (5E6), comparable lasing thresholds (microwatt) to higher Q silica devices are achieved because of the reduction in mode volume and the increase in Raman gain due to the presence of the Ti. Additionally, the efficiency of the laser increases with increasing Ti concentration.

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“…However, the precovering may lower the cavity quality factor, and in a realistic application, one would expect a simple method to sense the specific particles without the need of a complex biofunctionalization process. Over the past few years, the surface-enhanced Raman scattering using microcavities was proposed and shown to have great potential in specific single molecule detection [36][37][38][39], Also, stimulated Raman lasing in WGM microcavities has been studied [27,28,[40][41][42][43][44], A recent experiment [45] has shown the possibility of detecting the Raman emission of a single 1-/urn-radius particle in a fiber yfxiao@pku.edu.cn PACS number(s): 42.81.Pa, 73.20.Mf, 07.60.Vg ring resonator. Up to now, the previous theoretical studies on the cavity-enhanced single-particle Raman scattering mainly focus on the field distribution in far field in the framework of Lorentz-Mie theory [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Raman scattering of single nanoparticles in a high-Qwhispering-gallery microresonator

Liu

Xiao

2015

Phys. Rev. A

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We study Raman scattering of single nanoparticles coupled to a high-g whispering-gallery microresonator. It is found that cavity resonances greatly enhance the Raman signal, and the enhancement factor is as high as 108. Unlike the noncavity case, the signal power exhibits a nonmonotonic dependence on particle size, and it reaches the maximum when the Rayleigh scattering loss and the cavity intrinsic loss are comparable. We further analyze how the Raman signal intensity is iniluenced by different parameters including cavity quality factors and taper-cavity coupling strength. The detection limit of observing single-nanoparticle Raman signal is discussed hnally. As a potential application, this mechanism may provide an alternative way to detect specihc biological targets without the need of precovered biorecognitions.

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Cascaded Raman microlaser in air and buffer

Cited by 33 publications

References 14 publications

Applications of Optical Microcavity Resonators in Analytical Chemistry

Applications of Optical Microcavity Resonators in Analytical Chemistry

Titanium enhanced Raman microcavity laser

Enhanced Raman scattering of single nanoparticles in a high-Qwhispering-gallery microresonator

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