Kato Group

Nanoscale Quantum Photonics Laboratory, RIKEN

Research

Our primary interest is in the development and engineering of photonic and optoelectronic devices that would allow for manipulation of quantum states, as well as understanding the underlying physics in the operation of such devices. We exploit state-of-the-art semiconductor processing technology to fabricate nanoscale devices and perform experiments that combine microspectroscopy with electronic techniques. Our current focus is on devices that utilize individual single-walled carbon nanotubes and atomically-thin layered materials.

Introduction to single-walled carbon nanotubes

Chirality detemines the structure of carbon nanotubes at the atomic level.

Optical properties of carbon nanotubes

Carbon nanotubes have unique optical properties because of their one-dimensional structure.

Carbon nanotube optoelectronics

Semiconducting carbon nanotubes have direct bandgap, making them suitable for optoelectronic devices.

Carbon nanotube photonics

Integrating nanotube light emitters with photonic structures may open up possibilities for nanoscale optical circuits.

Mixed-dimensional heterostructures

One-dimensional carbon nanotubes can be combined with two-dimensional layered materials to form exotic heterostructures.

Van der Waals hybrid photonics

Photonic structures for integrating atomically-thin layered materials to achieve novel functionalities.
  • Chiral modes near exceptional points in symmetry broken h1 photonic crystal cavities
  • Quantization of mode shifts in nanocavities integrated with atomically thin sheets

    Quantum defect engineering

    Organic color centers enable technology relevant single photon sources.
  • Enhanced single photon emission using silicon microcavities
  • Formation of organic color centers in air-suspended carbon nanotubes using vapor-phase reaction