Phase shift spectra of a fiber-microsphere system at the single photon level.

  title={Phase shift spectra of a fiber-microsphere system at the single photon level.},
  author={Akira Tanaka and Takeshi Asai and Kiyota Toubaru and Hideaki Takashima and Masazumi Fujiwara and Ryo Okamoto and Shigeki Takeuchi},
  journal={Optics express},
  volume={19 3},
We succeeded in measuring phase shift spectra of a microsphere cavity coupled with a tapered fiber using a weak coherent probe light at the single photon level. We utilized a tapered fiber with almost no depolarization and constructed a very stable phase shift measurement scheme based on polarization analysis using photon counting. Using a very weak probe light (n = 0.41), we succeeded in observing the transition in the phase shift spectrum between undercoupling and overcoupling (at gap… 

Figures from this paper

Polarization-purity spectra of a tapered-fiber-coupled microsphere cavity system at cryogenic temperatures

An ultrahigh-Q optical microcavity coupled with a tapered fiber is an ideal system for the cavity quantum electrodynamics (CQED). In particular realizing this system at cryogenic temperature is

Coupling of ultrathin tapered fibers with high-Q microsphere resonators at cryogenic temperatures and observation of phase-shift transition from undercoupling to overcoupling.

The authors cooled ultrathin tapered fibers to cryogenic temperatures and controllably coupled them with high-Q microsphere resonators at a wavelength close to the optical transition of diamond nitrogen vacancy centers, demonstrating a discrete transition from undercoupling to overcoupling.

Controling the coupling properties of active ultrahigh-Q WGM microcavities from undercoupling to selective amplification

It is shown that an optical gain provided by erbium ions can compensate for residual losses and it is possible to control the coupling regime of an ultrahigh Q-factor three port microresonator from undercoupling to spectral selective amplification by changing the pumping rate.

Instructions for use Title Optical transmittance degradation in tapered fibers

We investigated the cause of optical transmittance degradation in tapered fibers. Degradation commences immediately after fabrication and it eventually reduces the transmittance to almost zero. It is

Fiber Sensing Based on New Structures and Post-Processing Enhancement

The work described in this PhD Thesis focuses on the post-processing of optical fibers and their enhancement as sensing element. Since the majority of sensors presented are based in Fabry-Perot

Packaged chalcogenide microsphere resonator with high Q-factor

The fabrication and characterization of a packaged As2S3 microsphere resonator coupled to a tapered fiber using a low refractive index UV-curable polymer are reported. Embedding provides an efficient

Analysis of the coupling efficiency of a tapered space receiver with a calculus mathematical model

We establish a calculus mathematical model to study the coupling characteristics of tapered optical fibers in a space communications system, and obtained the coupling efficiency equation. Then, using

The fabrication of a tapered fiber connector and its coupling efficiency

In order to reduce the adverse influence of transversal displacement of the optical fiber connector, we propose the directional tapered communication fiber connector, in which the fiber head is

Optical transmittance degradation in tapered fibers.

The results clearly show that the degradation of optical transmittance in tapered fibers is mostly due to dust particles and that it is not related to the humidity.

Effect of Substrates on the Temperature Dependence of Fluorescence Spectra of Nitrogen Vacancy Centers in Diamond Nanocrystals

The temperature dependence of fluorescence spectra of nitrogen vacancy (NV) centers in diamond nanocrystals is investigated in terms of the ability of the substrate to suppress the fluorescence



Observation of Normal and Anomalous Dispersions in a Microsphere Taper Fiber System

A dielectric microsphere may be considered as an artificial photonic atom. The electromagnetic modes in the microsphere are completely assigned with indexes similar to those used to characterize

Slow and fast light in a microsphere-optical fiber system

The dispersion relation in a system of a fiber taper coupled with a microsphere is investigated. On the undercoupling condition, in which the coupling strength between the sphere and the fiber is

Morphology-dependent resonances of a microsphere-optical fiber system.

A new model is presented that describes this interaction in terms of the fiber-sphere coupling coefficient and the microsphere's intrinsic quality factor Q(0) to obtain expressions for the finesse and the Q factor of the composite particle-fiber system, the resonance width, and the depth of the dips measured in the transmission spectra.

Fiber-coupled microsphere laser.

A 1.5-microm - wavelength fiber laser formed by placement of glass microsphere resonators along a fiber taper serves the dual purpose of transporting optical pump power into the spheres and extracting the resulting laser emission.

Hybrid quantum repeater based on dispersive CQED interactions between matter qubits and bright coherent light

We describe a system for long-distance distribution of quantum entanglement, in which coherent light with large average photon number interacts dispersively with single, far-detuned atoms or

Very high-Q whispering-gallery mode resonances observed on fused silica microspheres

We have studied by phase modulation spectroscopy the whispering-gallery modes (Mie resonances) of 60 to 200 μm diameter microspheres obtained by fusing with a CO2 laser the end of a high-transmission

Fiber-microsphere system at cryogenic temperatures toward cavity QED using diamond NV centers.

The coupling of a microsphere resonator to a tapered fiber was demonstrated at cryogenic temperatures (8 - 13 K) and investigated with a probe laser light whose frequency around the zero phonon line

Ultralow-threshold Raman laser using a spherical dielectric microcavity

This work demonstrates a micrometre-scale, nonlinear Raman source that has a highly efficient pump–signal conversion (higher than 35%) and pump thresholds nearly 1,000 times lower than shown before, which represents a route to compact, ultralow-threshold sources for numerous wavelength bands that are usually difficult to access.

Efficiencies for the single-mode operation of a quantum optical nonlinear shift gate

We investigate the single mode operation of a quantum optical nonlinear \pi phase shift gate implemented by a single two-level atom in one-dimensional free space. Since the single mode property of

Ideality in a fiber-taper-coupled microresonator system for application to cavity quantum electrodynamics.

To verify this level of coupling, a technique is introduced that can both measure ideality over a range of coupling strengths and provide a practical diagnostic of parasitic coupling within the fiber-taper-waveguide junction.