Whispering-gallery waves

Oraevsky, Anatolii N

doi:10.1070/qe2002v032n05abeh002205

Cited by 386 publications

(369 citation statements)

References 56 publications

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“…At first glance, the existence of the voids seems to contradict the WGM mode resonances in the luminescence as the voids in the microsphere are strong light scatterers. To clarify the contradictory findings, we calculated the electric field intensity distribution [20] within the microsphere for a typical TE WGM mode with a radial mode number n = 1, a polar number l = 19, an azimuthal mode number m = l, and a wavelength of 554.31 nm corresponding to the highest peak shown in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium

Minowa¹,

Oguni²,

Ashida³

2017

Opt. Express

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ZnO microspheres fabricated via laser ablation in superfluid helium were found to have bubble-like voids. Even a microsphere demonstrating clear whispering gallery mode resonances in the luminescence had voids. Our analysis confirmed that the voids are located away from the surface and have negligible or little effect on the whispering gallery mode resonances since the electromagnetic energy localizes near the surface of these microspheres. The existence of the voids indicates that helium gas or any evaporated target material was present within the molten microparticles during the microsphere formation.

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Section: Resultsmentioning

confidence: 99%

Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium

Minowa¹,

Oguni²,

Ashida³

2017

Opt. Express

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“…j ,m z ,q is a normal mode of Maxwell equations with an associated eigenfre- [21,47]. These eigenfrequencies ω (x ) j ,m z ,q can be found by solving the following two transcendental equations: (18) where…”

Section: Multipolar Expression Of the Normal Modesmentioning

confidence: 99%

Purcell factor of spherical Mie resonators

Zambrana‐Puyalto

Bonod²

2015

Phys. Rev. B

139

112

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We present a modal approach to compute the Purcell factor in Mie resonators exhibiting both electric and magnetic resonances. The analytic expressions of the normal modes are used to calculate the effective volumes. We show that important features of the effective volume can be predicted thanks to the translation-addition coefficients of a displaced dipole. Using our formalism, it is easy to see that, in general, the Purcell factor of Mie resonators is not dominated by a single mode, but rather by a large superposition. Finally we consider a silicon resonator homogeneously doped with electric dipolar emitters, and we show that the average electric Purcell factor dominates over the magnetic one.arXiv:1501.07452v2 [physics.optics]

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“…Often this problem is solved by expanding the initial guided wave in terms of the modes of the resonator in free space. 40 However, such an expansion is only an approximation and an accurate solution would require the use of the modes of the combined system, e.g., the waveguiding structure and resonator. This approximation is expected to become less accurate as the distance between the resonator and the surface decreases.…”

Section: Theoretical Modeling Of Resonant Forcesmentioning

confidence: 99%

Giant resonant light forces in microspherical photonics

Svitelskiy

Maslov³

et al. 2013

Light Sci Appl

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Resonant light pressure effects can open new degrees of freedom in optical manipulation with microparticles, but they have been traditionally considered as relatively subtle effects. Using a simplified two-dimensional model of surface electromagnetic waves evanescently coupled to whispering gallery modes (WGMs) in transparent circular cavities, we show that under resonant conditions the peaks of the optical forces can approach theoretical limits imposed by the momentum conservation law on totally absorbing particles. Experimentally, we proved the existence of strong peaks of the optical forces by studying the optical propulsion of dielectric microspheres along tapered microfibers. We observed giant optical propelling velocities ,0.45 mm s 21 for some of the 15-20 mm polystyrene microspheres in water for guided powers limited at ,43 mW. Such velocities exceed previous observations by more than an order of magnitude, thereby providing evidence for the strongly enhanced resonant optical forces. We analyzed the statistical properties of the velocity distribution function measured for slightly disordered (,1% size variations) ensembles of microspheres with mean diameters varying from 3 to 20 mm. These results demonstrate a principal possibility of optical sorting of microspheres with the positions of WGM resonances overlapped at the wavelength of the laser source. They can be used as building blocks of the lossless coupled resonator optical waveguides and various integrated optoelectronics devices.

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Whispering-gallery waves

Cited by 386 publications

References 56 publications

Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium

Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium

Purcell factor of spherical Mie resonators

Giant resonant light forces in microspherical photonics

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