Main Research Subjects of Arakawa and Iwamoto Laboratories
- Control the photons and elctrons -


Fabrication Technologies of Quantum Dots
For the purpose of the development of nano-photonic and electron devices, we investigate fundamental of the formation process of quantum dots in order to establish the perfect control of electronic states. In particular, suppression of the size fluctuation and realization of high-density quantum dots are the main technologies to be investigated in relation to the self-assembled InAs-based quantum dots. Moreover, fabrication technologies of quantum dots with various materials including GaN and organic semiconductors are also investigated.

Fundamental understanding and control of quantum dots

Fabrication of quantum dots with high uniformity and high density

Growth of quantum dots with various materials including GaN and organic semiconductors

Fabrication Technologies of Photonic Nanostructures
We develop the fundamental technologies of photonic crystals with the potential for achieving ultimate control of photons. For this purpose, semiconductor-based two-dimensional photonic crystal slabs with various active elements are extensively studied. Three-dimensional photonic crystals are also studied for the full confinement of photons. We introduce the micro-machining and its related technologies to realize advanced optical devices such as ultra-small optical-switching and wavelength-tuning functional devices.

Fabrication of high-quality active two- and three-dimensional photonic crystal

Photonic crystal with quantum dots

Photonic crystal with micromachining structures

Manipulation of Electrons and Photons in Nanostructures
We investigate the optical and electronic properties of quantum dots necessary for the realization of advanced photonic and electron devices, in particular, focusing on clarifying the interaction between electron-photon interactions in quantum dots and photonic nanostructures. Control of single photon emission and detection, both of which are indispensable ingredients for quantum information technologies, is also extensively investigated. Furthermore, the novel physics of coupled/uncoupled quantum dots will be explored with the goal of quantum computations.

Manipulation of photon-electron interaction in quantum dots and photonic crystal

Control of electron-phonon interaction in nanostructures

Manipulation of correlated electrons in quantum dots

Development of Nano-Photonic and Electron Devices
We establish device technologies for high-speed quantum dot lasers (>40GHz) with low spectral chirping, as well as ultralow threshold photonic crystal lasers in which electron-photon interaction is precisely controlled. Furthermore, single photon emitters and single electronics are explored for application to quantum cryptography communication and quantum computing devices.

Establishment of device technologies aiming at high speed quantum dot

lasers (>40GHz) with low spectral chirping

Development of active photonic crystal devices

Investigation of single photon emitters and single electronics