Theoretical Analysis and Laser Spectroscopy of Nanostructures
We mainly investigate the electronic states and optical properties of semiconductor nanostructures, organic nanostructures, and photonic crystals by laser spectroscopy. In the second mid-term research project that started in 2006, we achieved (1) acceleration and suppression of spontaneous emission of photons by the Purcell effect and the photonic band gap for photonic crystal micro cavities embedded with GaAs quantum dots; (2) double enhancement of spontaneous emission due to the large photon density of states in the vicinity of the photonic band gap; (3) development of a high-resolution micro photoluminescence method by single photon Fourier spectroscopy and its application to the clarification of the electronic states and their relaxation processes of quantum dots and rings; (4) excitonic Rabi oscillation (qubit operation) by resonant excitation with pico second laser pulses; (5) observation of excitonic Aharonov-Bohm effect by micro photoluminescence spectroscopy in a high magnetic field; (6) development of a compact liquid helium cryostat with a superconducting magnet for micro photoluminescence.
Materials
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Excitonic Rabi oscillation of GaAs quantum dots- High-resolution micro photoluminescence spectroscopy
- Purcell effect of GaAs quantum dots
- Optical properties of organic nanofibers and nanorings
- Electronic levels and exciton Aharonov-Bohm effect of GaAs quantum double rings
- Development of liquid helium cryostat with a superconducting magnet for micro photoluminescence spectroscopy
- Double enhancement of spontaneous emission of light at photonic band edges
- Novel light transport phenomena via analogy of electronic systems