Takashi Kita

Modelling Terahertz Wave Generation in InAs Quantum-Dot Containing GaAs-Based Photoconductive Antenna

InAs quantum-dot-containing GaAs-based photoconductive antenna (PCA) devices are promising for terahertz (THz) generation under below-bandgap excitation by ultrafast laser pulses. This paper describes the results of rate equation analyses of these devices by assuming the two-step...

Energy offsets between the Er 3+ 4 f -states and the GaAs energy levels important for photon ratchet intermediate-band solar cells

The lifetime of the carriers present in the intermediate bands is short, and thus an additional band at slightly lower energies is introduced in photon ratchet intermediate-band solar cells to reduce the impact of the intermediate-band lifetime. This so-called ratchet band should...