Quantum Photonics Group

STAFF

KURODA, Takashi; KURIMURA, Sunao; TAKAZAWA, Ken; OCHIAI, Tetsuyuki（Staff Tabs）

AIM and GOAL

• We are aiming to create innovative photonic devices exploiting new optical functionalities that appear for advanced nanostructures.
• Study of semiconductor quantum nanostructures, their physics and applications to novel quantum light sources.
• Study of originally fabricated organic nanofibers. Their application to microoptics free from diffraction limits.
• Design of innovative quantum structures that enable artificial control of electromagnetic fields. Prediction of new quantum optical functionalities.

APPROACH

• Advanced laser spectroscopy: We develop new spectroscopy techniques, which enable to detect optical signals from small regions, with broad spectral ranges from UV to mid-IR wavelengths.
• Quantum optics: We observe the generation of nonclassical light, which includes single photons and quantum-entangled pairs, and develop practical quantum light sources.
• Theoretical analysis: We perform electromagnetic and model analysis to investigate novel light-matter interactions in photonic nanostructures.

FIG 1 (Left) Anti-bunching characteristics of a quantum-dot single-photon source at a wavelength of 1.55 um. (Right) Setup for measuring the degree of quantum entanglement.

FIG 2 A micro-ring is fabricated from an organic dye nanofiber by micromanipulation. Fluorescence spectrum of the ring exhibits sharp resonance peaks, indicating that it functions as a ring resonator.

FIG 3 Eigenfrequency spectrum in a non-Hermitian photonic crystal. Due to the non-Hermitian nature, the eigenfrequencies spread out on the complex plane and form loops due to a spatial symmetry breaking.

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