Level-crossing and modal structure in microdroplet resonators

Attar, Sarah T.; Shuvayev, Vladimir; Martín, Leopoldo L.; Carmon, Tal

doi:10.1364/oe.24.013134

Cited by 14 publications

(10 citation statements)

References 36 publications

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“…The origin of abnormal photoelastic behavior of the bidisperse resonator can be manifold and related to both the material properties of the mixture and the WGM light localization physics. Nanodomain inhomogeneities can lead to modal crossing induced by the excitation of transverse modes of different polar mode order m into the polystyrene spheroid 33 and cross-polarization coupling effects, 34 in addition to the modal splitting. The application of strain into the spheroid can amplify such type of interaction, resulting in anomalous modal birefringence, which, in turn, is erroneously manifested as abnormal material birefringence and photoelastic behavior.…”

Section: Resultsmentioning

confidence: 99%

Probing Stress-Induced Optical Birefringence of Glassy Polymers by Whispering Gallery Modes Light Localization

et al. 2017

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An optical resonance method for the determination of the strain- and stress-optical coefficients of optically transparent polymers is presented and exemplified for monodisperse and bidisperse molecular weight polystyrene (PS). This method employs whispering gallery modes (WGMs) resonation inside a spheroid polymeric cavity, suspended on an optical fiber taper waist, which, in turn, is used for subjecting the polymeric resonator to controlled strain conditions. The wavelength shifts of equal order transverse electric and transverse magnetic polarization WGMs are measured, as well as their relative birefringence versus applied strain. For monodisperse PS microspheroids (2 and 50 kDa) the stress-optical coefficient is negative, contrary to the results for bulk PS in the glassy state indicating different phenyl group orientation of the PS monomer with respect to the strain direction. In the bidisperse (2 and 50 kDa) spheroid with a symmetric monomer composition, local structural irregularities are probably responsible for the observed coupling between WGMs. The method possesses metrological capabilities for probing the molecular orientation of polymer-based resonators.

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Section: Resultsmentioning

confidence: 99%

Probing Stress-Induced Optical Birefringence of Glassy Polymers by Whispering Gallery Modes Light Localization

et al. 2017

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“…Finally, it is worth noting that the ring-shaped lattice pattern shown in Fig. 2 b is similar to the stationary interference pattern of the composite WGMs that have different wavelengths but share the same resonance frequency 41 – 43 .…”

Section: Resultsmentioning

confidence: 62%

Microscale whispering-gallery-mode light sources with lattice-confined atoms

Vollmer

2021

Sci Rep

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Microlasers, relying on the strong coupling between active particles and optical microcavity, exhibit fundamental differences from conventional lasers, such as multi-threshold/thresholdless behavior and nonclassical photon emission. As light sources, microlasers possess extensive applications in precision measurement, quantum information processing, and biochemical sensing. Here we propose a whispering-gallery-mode microlaser scheme, where ultracold alkaline-earth metal atoms, i.e., gain medium, are tightly confined in a two-color evanescent lattice that is in the ring shape and formed around a microsphere. To suppress the influence of the lattice-induced ac Stark shift on the moderately-narrow-linewidth laser transition, the red-detuned trapping beams operate at a magic wavelength while the wavelength of the blue-detuned trapping beam is set close to the other magic wavelength. The tiny mode volume and high quality factor of the microsphere ensure the strong atom-microcavity coupling in the bad-cavity regime. As a result, both saturation photon and critical atom numbers, which characterize the laser performance, are substantially reduced below unity. We explore the lasing action of the coupled system by using the Monte Carlo approach. Our scheme may be potentially generalized to the microlasers based on the forbidden clock transitions, holding the prospect for microscale active optical clocks in precision measurement and frequency metrology.

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“…The free spectral range (FSR) measured in the graphs is in good agreement with the theoretically expected values based on the FSR formula and the corresponding resonant wavelength [ 1 ]. In such a light coupling scheme WGMs with |m| ≠ l will be delocalized from the azimuthal circumference of the BaTiO 3 microsphere defined by the excitation plane of the SOFT [ 28 ], possibly allowing modal crossing between modes of high difference between m and l modal order, facilitated by the microsphere wedging perturbation and eccentricity of the microsphere.…”

Section: Resultsmentioning

confidence: 99%

Multiple Light Coupling and Routing via a Microspherical Resonator Integrated in a T-Shaped Optical Fiber Configuration System

et al. 2018

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We demonstrate a three-port, light guiding and routing T-shaped configuration based on the combination of whispering gallery modes (WGMs) and micro-structured optical fibers (MOFs). This system includes a single mode optical fiber taper (SOFT), a slightly tapered MOF and a BaTiO3 microsphere for efficient light coupling and routing between these two optical fibers. The BaTiO3 glass microsphere is semi-immersed into one of the hollow capillaries of the MOF taper, while the single mode optical fiber taper is placed perpendicularly to the latter and in contact with the equatorial region of the microsphere. Experimental results are presented for different excitation and reading conditions through the WGM microspherical resonator, namely, through single mode optical fiber taper or the MOF. The experimental results indicate that light coupling between the MOF and the single mode optical fiber taper is facilitated at specific wavelengths, supported by the light localization characteristics of the BaTiO3 glass microsphere, with spectral Q-factors varying between 4.5 × 103 and 6.1 × 103, depending on the port and parity excitation.

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Level-crossing and modal structure in microdroplet resonators

Cited by 14 publications

References 36 publications

Probing Stress-Induced Optical Birefringence of Glassy Polymers by Whispering Gallery Modes Light Localization

Probing Stress-Induced Optical Birefringence of Glassy Polymers by Whispering Gallery Modes Light Localization

Microscale whispering-gallery-mode light sources with lattice-confined atoms

Multiple Light Coupling and Routing via a Microspherical Resonator Integrated in a T-Shaped Optical Fiber Configuration System

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