The efficient coupling of light from a tapered fiber coupled microsphere resonator to localized surface plasmon modes of
Au-coated tip was demonstrated. To verify efficient localized surface plasmon excitation at the metal tip via a tapered
fiber coupled microsphere resonator, we measured second harmonic generation from the top of Au-coated tip. From the
results, in spite of a weak CW excitation, we succeeded in repeatedly observing SHG from the top of the Au-coated tip
via a tapered fiber coupled microsphere resonator system, which could focus the light with the coupling efficiency of
about 63.2 % into the nanoscale domain of the metal tip with the effective cross section of 358.2 nm2.
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 vitally important and has been
recently explored for various CQED applications including solid-state atom-photon strong coupling, vibrational mode
cooling, and photonic quantum gates. These cryogenic fiber-coupled microcavity systems, however, suffer from
mechanical vibrations due to cooling systems and distortions caused by large temperature change. These factors may
cause the degradation in polarization of probe light field in the system. Here we report the analysis of the polarization
state in a tapered-fiber-coupled microsphere cavity at cryogenic temperatures. By scanning the wavelength of the probe
light at around 637 nm, which can be used for the diamond nitrogen vacancy centers, the spectral analysis of the
polarization state was performed at 8-30 K. We have found that the degree of polarization (DOP, classical analogue of
purity) at cryogenic temperatures does not show significant change compared to that measured at room temperature. This
fact indicates that the system can conserve the polarization at low temperature to the extent comparable to that at room
temperature, which is enough for the evaluation of the quantum phase gate.
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