Optical microresonators have proven powerful in a wide range of applications, including cavity quantum electrodynamics1-3, biosensing4, microfludics5, and cavity optomechanics6-8. Their performance depends critically on the exact distribution of optical energy, confined and shaped by the nanoscale device geometry. Near-field optical probes9 can image this distribution, but the physical probe ne...

In acoustic energy, harvesting energy is captured from external noise sources, controlled and stored for various applications. Despite the prevalence of acoustic energy a major challenge of energy harvesting is the low power density. Acoustic Energy Harvester consists of a resonator, an acoustic transducer and a storage device. When acoustic resonator is excited by an incident wave at its reson...

We demonstrate trapping of a single 85Rb atom at distance 200 nm from the surface whispering-gallery-mode bottle microresonator. The is trapped in an optical potential, which created by retroreflecting red-detuned focused laser beam resonator surface. counteract trap-induced light shift atomic transition frequency superposing second with suitably chosen power and detuning. This allows us to obs...

Niobium nanobridge SQUIDs have shown exceptional noise performance with potential applications in quantum information processing, weak signal detection and single spin where the geometry should enable efficient electromagnetic coupling to implanted spins. Combining such devices dispersive microwave readout circuitry allows sensitivity be further improved by overcoming standard thermal limit. He...

This thesis describes a theoretical and experimental investigation of the intensities, linewidths, and frequencies of radiation by an atom in an optical resonator. It is found that the atom's spontaneous emission rate may be enhanced or inhibited, depending on the tuning of the resonator, and its transition frequencies shifted. A simple classical description of these effects is given in which t...

The performance of a chaotic micro resonator is improved by redesigning a quadratic controller reported in a previous study. The chaotic micro resonator is composed of an electrostatic actuator and a voltage regulator (controller). The actuator is made of cantilever beam electrode above a fixed electrode. The actuator voltage, and consequently the electrostatic force magnitude, is controlled to...

We investigate spatio-temporal dynamics of two-wave mixing processes in a photorefractive medium, considering two different configurations. In the counterpropagating geometry, above a primary instability threshold we observe the onset of spontaneous spatial modulation of the Gaussian beam profile due to a static external electric field in the case of a self-focusing non-linearity. Running trans...

we propose a new ring resonator side-coupled m-z interferometer all-optical switch throughthe pumped nonlinear directional coupler. by controlling pump power p to lead the coupler reflectivityr approaching to 1, the resonator finesse will be enhanced dramatically, and then the minimumswitching power in silica-based practice devices can be obtained. as a sample, we use a nonlinearcoupler made by...