This work takes inspiration from chemistry where the spectral characteristics of the molecules are determined by hybridization of electronic states evolving from the individual atomic orbitals. Based on analogy between quantum mechanics and the classical electrodynamics, we sorted dielectric microspheres with almost identical positions of their whispering gallery mode (WGM) resonances. Using th...

— Confinement of light into small volumes has become an essential requirement for photonic devices; examples of this trend are provided by optical fibers, integrated optical circuits, semiconductor lasers, and photonic crystals. Optical dielectric resonators supporting Whispering Gallery Modes (WGMs) represent another class of cavity devices with exceptional properties, like extremely small mod...

Titanium doped sapphire (Ti:sapphire) is a laser gain material with broad bandwidth benefiting from the stability of sapphire. These favorable characteristics Ti:sapphire have given rise to femtosecond lasers and optical frequency combs. Shaping single crystal into millimeter sized high quality (Q) whispering gallery mode resonator (Q ≈ 108) reduces lasing threshold 14.2 mW increases slope effi...

The paper reports on the coupling of Parity-Time (PT)-symmetric whispering gallery resonators with realistic material and gain/loss models. Response of the PT system is analyzed for the case of low and high material and gain dispersion, and also for two practical scenarios when the pump frequency is not aligned with the resonant frequency of the desired whispering gallery mode and when there is...

We demonstrate the trapping of single atoms in evanescent field a whispering-gallery-mode (WGM) resonator with standing wave optical dipole trap. present our progress towards an improved trap loading scheme.

The leakage loss due to TM-TE mode coupling of TM-like whispering gallery mode in silicon-on-insulator (SOI) thin-ridge disk resonators is investigated for the first time to the best of our knowledge. We show that the propagation losses of TM-like mode in thin-ridge SOI disk resonators are significantly impacted by the radius of the disk. This behavior is predicted by a simple phenomenological ...

The previous chapter introduces biosensor technologies according to the physical nature of their signal transduction processes. Optical biosensors are just one category that includes a wide array of novel devices. The present work deals with a technology based on whispering gallery mode (WGM) optical resonators [60, 61]. Understanding how they are fabricated and used is important for appreciati...

In this paper, we review the literature on optical evanescent field sensing in resonant cavities where aptamers are used as biochemical receptors. The combined advantages of highly sensitive whispering gallery mode resonator (WGMR)-based transducers, and of the unique properties of aptamers make this approach extremely interesting in the medical field, where there is a particularly high need fo...

Micro/nanoscale radiation transfer in whispering-gallery mode (WGM) microcavities is investigated. Each cavity consists of a waveguide and a microdisk coupled in a planar chip. In order to characterize the WGM resonance phenomena, studies of configuration parameters, specifically the microdisk size, the gap distance separating the microdisk and waveguide, and the waveguide width are numerically...