Optimal sizes of dielectric microspheres for cavity QED with strong coupling

  title={Optimal sizes of dielectric microspheres for cavity QED with strong coupling},
  author={J. R. Buck and Harry J. Kimble},
  journal={Physical Review A},
The whispering gallery modes (WGMs) of quartz microspheres are investigated for the purpose of strong coupling between single photons and atoms in cavity quantum electrodynamics (cavity QED). Within our current understanding of the loss mechanisms of the WGMs, the saturation photon number n0 and critical atom number N0 cannot be minimized simultaneously, so that an "optimal" sphere size is taken to be the radius for which the geometric mean sqrt(n[sub 0]N[sub 0]), is minimized. While a general… 
Cavity enhanced optical processes in microsphere resonators
Optical microcavities play an important role in a manifold of optical processes, ranging from Cavity Quantum Electrodynamics (QED) to photonics and sensing. A very efficient way to trap light is by
Thermo-optical tuning of whispering gallery modes in erbium doped microspheres
Spherical whispering gallery mode (WGM) resonators can be used in a broad range of applications from bio-sensing to laser engineering. Beyond the interest for applied studies, such resonators are
Magnetic microtraps for cavity QED, Bose-Einstein condensates, and atom optics
The system comprised of an atom strongly coupled to photons, known as cavity quantum electrodynamics (QED), provides a rich experimental setting for quantum information processing, both in the
Fundamentals and applications of microsphere resonator circuits
  • V. Astratov
  • Materials Science
    2009 11th International Conference on Transparent Optical Networks
  • 2009
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
Plasmonic cavities and optical nanosources
Optical microcavities exhibit high resonance quality, so that, they are of key interest for the design of low-threshold lasers or for achieving strong coupling regime. But, such systems support modes
Unveiling the coupling of single metallic nanoparticles to whispering-gallery microcavities
Whispering gallery mode resonators (WGMRs) trap light over many optical periods using total internal reflection. Thereby, they host multiple narrowband circulating modes that find applications in
Gap effects on whispering-gallery mode microresonances
Photon tunneling between an optical resonator and a light-delivery coupler is strongly dependent on the gap dimension which can vary from zero to size of an optical wavelength involved. In this
Fiber-coupled ultra-high-Q microresonators for nonlinear and quantum optics
The ability to confine optical energy in small volumes for long periods of time is desirable for a number of applications, ranging from photonics and nonlinear optics, to fundamental studies in
Inner structure of ZnO microspheres fabricated via laser ablation in superfluid helium
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
Technology CAD based design of semiconductor optical microcavities for single photon emitters
Optical microcavities that contain single quantum dots have promising applications in quantum cryptography as sources of single photons. The realisation of efficient devices relies on the ability to


Tunable whispering gallery modes for spectroscopy and CQED experiments
We have tuned the whispering gallery modes of a fused silica micro-resonator over nearly 1 nm at 800 nm, i.e.?over half of a free spectral range or the equivalent of 106 linewidths of the resonator.
We report measurements of cavity-QED effects for the radiative coupling of atoms in a dilute vapor to the external evanescent field of a whispering-gallery mode (WGM) in a fused silica microsphere.
High-Q measurements of fused-silica microspheres in the near infrared.
The observed independence of Q from wavelength indicates that losses for the WGM's are dominated by a mechanism other than bulk absorption in fused silica in the near infrared.
Optical microsphere resonators: optimal coupling to high-Q whispering-gallery modes
A general model is presented for coupling of high-Q whispering-gallery modes in optical microsphere resonators with coupler devices that possess a discrete and continuous spectrum of propagating
Ultimate Q of optical microsphere resonators.
We demonstrate the quality factor Q - (0.8 +/- 0.1) x 10(10) of whispering-gallery modes in fused-silica microspheres at 633 nm, close to the ultimate level determined by fundamental material
Quantum structure and dynamics for atom galleries
The bound state structure and dynamics for an atom trap formed from the whispering gallery modes (WGMs) of a dielectric microsphere are investigated. The coupling of the quantized internal and
Optical processes in microcavities
The dielectric microstructures act as ultrahigh Q factors optical cavities, which modify the spontaneous emission rates and alter the spatial distribution of the input and output radiation. The
Some characteristics of resonant electromagnetic modes in a dielectric sphere
A set of formulae have been developed for calculations of the optical characteristics of droplets under conditions of whispering gallery mode (WGM) excitation. The WGM excitation is shown to cause
Mapping whispering-gallery modes in microspheres with a near-field probe.
The use of a near-field probe is demonstrated to map the angular dependence of high-Q whispering-gallery modes in fused-silica microspheres to investigate the lifting of spherical degeneracy in the system.
Spontaneous emission rate and level shift of an atom inside a dielectric microsphere
Abstract The transition frequency shift and the spontaneous decay rate (the radiative linewidth) variation of an atom placed in a transparent dielectric microsphere are presented. It is demonstrated