Raman lasing near 650nm from pure water microdroplets on a superhydrophobic surface

Kiraz, Alper; Yorulmaz, S. Cigdem; Yorulmaz, Mustafa; Sennaroğlu, Alphan

doi:10.1016/j.photonics.2009.03.002

Cited by 6 publications

(12 citation statements)

References 12 publications

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“…Raman lasing was also reported in CCl 4 and CS 2 droplets. Raman lasing near 630 nm and 650 nm from glycerol‐water and pure water microdroplets on a superhydrophobic surface was described. In , the Q factors of WGMs exhibiting Raman lasing were

\sim 5 \times 10^{6}

.…”

Section: Wgm Microlasersmentioning

confidence: 99%

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Whispering gallery microcavity lasers

Özdemir

Yang

2012

Laser & Photonics Reviews

524

295

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Whispering gallery mode (WGM) optical microresonators have attracted intense interests in the past decades. The combination of high quality factors (Q) and small mode volumes of modes in WGM resonators significantly enhances the lightmatter interactions, making them excellent cavities for achieving low threshold and narrow linewidth lasers. In this Review, the progress in WGM microcavity lasers is summarized, and the laser performance considering resonator geometries and materials as well as lasing mechanisms is discussed. Label-free detection using WGM resonators has emerged as highly sensitive detection schemes. However, the resolution is mainly limited by the cavity Q factor which determines the mode linewidth. Microcavity lasers, due to their narrow laser spectral width, could greatly improve the detection resolution. Some recent developments in sensing using microcavity lasers are discussed.

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\sim 5 \times 10^{6}

.…”

Section: Wgm Microlasersmentioning

confidence: 99%

“…Raman lasing near 630 nm and 650 nm from glycerol‐water and pure water microdroplets on a superhydrophobic surface was described. In , the Q factors of WGMs exhibiting Raman lasing were

\sim 5 \times 10^{6}

. Zhang and Chang observed SBS generation from water and methanol microdroplets.…”

Section: Wgm Microlasersmentioning

confidence: 99%

Whispering gallery microcavity lasers

Özdemir

Yang

2012

Laser & Photonics Reviews

524

295

View full text Add to dashboard Cite

show abstract

“…The intrinsically high Q factors and small modal volumes afforded by WGMs make them interesting for a wide range of applications, such as microlasers, optical frequency comb generation, add-drop elements, novel light sources and fundamental a e-mail: matthew.foreman@mpl.mpg.de cavity quantum electrodynamical studies [17][18][19][20][21]. Furthermore, due to their extreme sensitivity to refractive index changes and optical absorption of the surrounding environment and resonator material itself, WGMs are also seeing use in chemical [22,23] and biological sensors [1,4,24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, liquid droplet resonators lend themselves to integration with microfluidic analyte delivery schemes and use on microfluidic analysis platforms, when combined with free space coupling techniques [35]. Despite these potential advantages, no experimental demonstration of droplet based WGM chemical detection was reported until recently, except for the work of Kiraz and coworkers who examined "surface-standing" glycerol drops doped with dye molecules for lasing experiments [17,18]. Indeed, it is only in a very recent separate experiment, that some of the current authors have reported the first proofof-concept demonstration of liquid droplet WGM resonators as chemical sensors [34].…”

Section: Introductionmentioning

confidence: 99%

Enhanced nanoparticle detection with liquid droplet resonators

Foreman

Avino

Zullo

et al. 2014

Eur. Phys. J. Spec. Top.

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Whispering gallery mode particle sensing experiments are commonly performed with solid resonators, whereby the sensing volume is limited to the weak evanescent tail of the mode near the resonator surface. In this work we discuss in detail the sensitivity enhancements achievable in liquid droplet resonators wherein the stronger internal fields and convenient means of particle delivery can be exploited. Asymptotic formulae are derived for the relative resonance shift, line broadening and mode splitting of TE and TM modes in liquid droplet resonators. As a corollary the relative fraction of internal and external mode energy follows, which is shown to govern achievable sensitivity enhancements of solute concentration measurements in droplet sensors. Experimental measurements of nanoparticle concentration based on whispering gallery mode resonance broadening are also presented.

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“…The constant g is the Raman gain which, for the transition at ν ∼ 3500 cm −1 , takes the value of 0.14 cm/GW (Ref. 16). The energy of the pump wavepacket can be then easily obtained from the spatially resolved absorbance (A = − log 10 T , where T = F shad,t (x, z)/F probe ) and then integrating it in the plane (x, z).…”

mentioning

confidence: 99%

Energy deposition dynamics of femtosecond pulses in water

Minardi

Milián

Majus

et al. 2014

Applied Physics Letters

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We exploit inverse Raman scattering and solvated electron absorption to perform a quantitative characterization of the energy loss and ionization dynamics in water with tightly focused near-infrared femtosecond pulses. A comparison between experimental data and numerical simulations suggests that the ionization energy of water is 8 eV, rather than the commonly used value of 6.5 eV. We also introduce an equation for the Raman gain valid for ultra-short pulses that validates our experimental procedure.Keywords: Inverse Raman Scattering, light matter interaction, cold plasma Femtosecond laser pulses tightly focused in dielectric media have a wide range of applications in science and technology. Because of their capability to deposit high ionization doses in volumes of a few cubic microns, they can be used to induce permanent, microscopic refractive index modification in solid dielectrics, thus enabling three-dimensional integrated optics 1,2 . By focusing femtosecond pulses in liquids, it is possible to induce localized chemical reactions such as photo-polymerization on the micro-nano-scale 3 . In aqueous media, such as biological tissues, tightly focused femtosecond laser pulses have been successfully employed for eye surgery 4 and treatment of cancerous cells 5 . Recent studies show that by tuning the input pulse chirp an effective control on the energy deposition in water is reached 6 . Future developments of these applications will benefit from a more advanced control of the energy deposition by means of arbitrarily spatiotemporally tailored laser wavepackets 7 . In this context, suitable diagnostic tools for real time analysis of energy deposition dynamics as well as a better understanding of the initial stages of the energy absorption in the dielectric medium are of foremost importance.In previous experiments based on quantitative shadowgraphy, we characterized the propagation of a 120 fs pulse focused with low NA in water 8,9 . In this configuration, the laser pulse enters a filamentation regime 10 leaving behind a tenuous, few-mm-long plasma channel which gets solvated on a ps timescale. The pulse dynamics (featuring pulse splitting and superluminal pulse formation) was clearly seen in the probe as an absorption feature, which we attributed to the imaginary part of an unspecified cross-phase modulation process (XPM) between pump and probe. a) Electronic mail: stefano@stefanominardi.eu.; http://stefanominardi.eu.

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Raman lasing near 650nm from pure water microdroplets on a superhydrophobic surface

Cited by 6 publications

References 12 publications

Whispering gallery microcavity lasers

Whispering gallery microcavity lasers

Enhanced nanoparticle detection with liquid droplet resonators

Energy deposition dynamics of femtosecond pulses in water

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