Book ChapterDOI
Fundamentals and applications of microsphere resonator circuits
Vasily N. Astratov
- Vol. 156, pp 423-457
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TLDR
In this paper, the authors describe the mesophotonics properties of microsphere resonator circuits and apply them to developing narrow spectral filters, delay lines, arrayed-resonator light emitting devices, tight focusing microprobes, sensors, and compact spectrometers.Abstract:
Microsphere resonator circuits have emerged as a technology allowing integration of cavities in all three spatial dimensions (3D) in chip-scale structures. This presentation is devoted to fabrication, optical properties and applications of mesoscale structures formed by microspheres. The “mesophotonics” properties of such structures stem from two properties of individual dielectric microspheres with dimensions comparable to the wavelength of light: (i) high quality factors of whispering gallery modes (WGMs) and (ii) subwavelength dimensions of the focused spots termed “photonic nanojets”. Traditionally, the resonant optical transport properties of such structures have been described by a tight binding approximation for photonic atoms. Recently we showed that the WGM-based transport in 2D and 3D systems with disorder can be understood on the basis of analogy with a percolation theory. Along with these resonant coupling effects very interesting properties of periodical focusing of light were observed in long chains of spheres. These properties were explained due to formation of nanojet-induced modes with small propagation losses. At the device level, these studies stimulate developing designs where coupled cavities are applied to developing narrow spectral filters, delay lines, arrayed-resonator light emitting devices, tight focusing micro-probes, sensors, and compact spectrometers.read more
Citations
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Journal ArticleDOI
Optical super-resolution by high-index liquid-immersed microspheres
TL;DR: In this article, it was shown that barium titanate glass microspheres with diameters in the range 2-220μm and with high refractive index (n∼∆ 1.9-2.1) can be used for super-resolution imaging of liquid-immersed nanostructures.
Journal ArticleDOI
Fluorescent and lasing whispering gallery mode microresonators for sensing applications
Tess Reynolds,Nicolas Riesen,Nicolas Riesen,Al Meldrum,Xudong Fan,Jonathan M. M. Hall,Tanya M. Monro,Tanya M. Monro,Alexandre François,Alexandre François +9 more
TL;DR: Active resonators containing a gain medium, allowing remote excitation and collection of the WGM-modulated fluorescence spectra, have emerged as an alternative to passive resonators.
Journal ArticleDOI
Low divergence photonic nanojets from Si3N4 microdisks.
TL;DR: High intensity sub-wavelength spots and low divergence nanojets are observed in a system of Si3N4 microdisks illuminated from the side with laser light of wavelengths 488 nm, 532 nm and 633 nm.
Journal ArticleDOI
Contact focusing multimodal microprobes for ultraprecise laser tissue surgery.
Arash Darafsheh,Amir Fardad,Nathaniel M. Fried,Andrew N. Antoszyk,Howard S. Ying,Vasily N. Astratov +5 more
TL;DR: Focusing of multimodal beams by chains of dielectric microspheres assembled directly inside the cores of hollow waveguides is studied by using numerical ray tracing for potential applications including ultra precise laser ablation or coagulation in the eye and brain, cellular surgery, and the coupling of light into photonic nanostructures.
Journal ArticleDOI
Giant resonant light forces in microspherical photonics
Yangcheng Li,Oleksiy Svitelskiy,Oleksiy Svitelskiy,Alexey V. Maslov,David Carnegie,Edik U. Rafailov,Vasily N. Astratov +6 more
TL;DR: Astratov et al. as mentioned in this paper used a simplified two-dimensional model of surface electromagnetic waves evanescently coupled to whispering gallery modes (WGMs) in transparent circular cavities, showing that under resonant conditions the peaks of the optical forces can approach theoretical limits imposed by the momentum conservation law on totally absorbing particles.
References
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