| Presentation | 2011-12-15 Recent progress and future prospects ofterahertz quantum cascade lasers Hideki Hirayama, Wataru Terashima, Tsung-Tse Lin, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Terahertz-quantum cascade lasers (THz-QCLs) are small-size, continuous-wave (cw) and long-lifetime THz light sources with high-efficiency, high-power, narrow line-width properties. For these reasons, there is strong demand for developing a practically applicable THz-QCL especially for the applications in non-destructive investigations. We are studying on GaAs and III-nitride-based THz-QCLs, for the purpose of achieving higher operating temperature (>230K) and unexplored frequency range (0.5-1THz and 5-12THz) on THz-QCLs. Recently, we achieved 3.7 THz lasing from GaAs/AlGaAs THz-QCL. We obtained maximum operating temperature (Tmax) of 143 K and minimum threshold current density (Jth) of 0.8 KA/cm^2. We also observed Jth reductions of the GaAs/AlGaAs QCLs as increasing the Al-composition of AlGaAs barriers. We also developing THz-QCLs using III-nitride semiconductors, for the purpose of realizing 5-12 THz frequency range QCLs. We fabricated GaN/AlGaN QCL structures successfully by using a droplet elimination by thermal annealing (DETA) technique in MBE growth. We then achieved first spontaneous electroluminescence by intersubband transition in GaN-based THz-QCL structures, with peak frequencies from 1.4 to 2.8 THz. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | terahertz wave / quantum cascade laser / MBE crystal growth / intersubband transition |
| Paper # | ED2011-113 |
| Date of Issue |
| Conference Information | |
| Committee | ED |
|---|---|
| Conference Date | 2011/12/7(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Electron Devices (ED) |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Recent progress and future prospects ofterahertz quantum cascade lasers |
| Sub Title (in English) | |
| Keyword(1) | terahertz wave |
| Keyword(2) | quantum cascade laser |
| Keyword(3) | MBE crystal growth |
| Keyword(4) | intersubband transition |
| 1st Author's Name | Hideki Hirayama |
| 1st Author's Affiliation | RIKEN() |
| 2nd Author's Name | Wataru Terashima |
| 2nd Author's Affiliation | RIKEN |
| 3rd Author's Name | Tsung-Tse Lin |
| 3rd Author's Affiliation | RIKEN |
| Date | 2011-12-15 |
| Paper # | ED2011-113 |
| Volume (vol) | vol.111 |
| Number (no) | 338 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |