RIKEN Center for Advanced Photonics Terahertz Quantum Device Research Team

Team Leader: Hideki Hirayama (D.Eng.)

Japanese Page

Research Summary

We develop advanced terahertz emitting and sensing devices based on inter sub-band optical transition of semiconductor quantum cascade structures. Firstly, we design and fabricate novel quantum cascade superlattice (SL) structures for high-efficiency terahertz transitions and develop terahertz quantum cascade laser (QCLs) with frequency range between 1-100 THz. We also develop high-sensitivity terahertz-wave detectors and terahertz-infrared (IR) light modulators using inter sub-band absorption of quantum wells. We hope through this research to construct what will become the base of the next-generation advanced terahertz imaging system.

Main Research Fields

Engineering

Related Research Fields

Interdisciplinary Science & Engineering

Keywords

Terahertz
Quantum cascade laser
Inter-subband transition emission
Nitride Semiconductors
Crystal growth

Selected Publications

1. Wang, L., Chen, M., Lin, T. T., Wang, K., and Hirayama, H.:
"Interdiffusion limiting on self-consistent optical gain in terahertz quantum cascade lasers"
Applied Physics Express, pp. 072004 (2023).
2. Wang, L., Lin, T. T., Wang, K., and Hirayama, H.:
"Clean three-level direct-phonon injection terahertz quantum cascade laser"
Applied Physics Letters, pp. 221103 (2023).
3. Wang, L., Chen, M., Lin, T. T., Wang, K., and Hirayama, H.:
"Terahertz quantum cascade laser considering compositional interdiffusion effect"
Applied Physics Express, pp. 032007 (2023).
4. Wang, L., Lin, T. T., Wang, K., and Hirayama, H.:
"Optical gain reduction caused by nonrelevant subbands in narrow-period terahertz quantum cascade laser designs"
scientific reports, pp. 22228 (2022).
5. Lin, T. T., Wang, L., Wang, K., Grange, T., Birner, S., Miyoshi, T., and Hirayama, H.:
"Increasing the output power of a heavily doped terahertz quantum cascade laser by avoiding the subband misalignment"
Journal of Applied Physics, pp. 173101 (2022).
6. Wang, L., Lin, T. T., Wang, K., and Hirayama, H.:
"Nonrelevant quantum levels effecting on the current in 2?well terahertz quantum cascade lasers"
scientific reports, pp. 17378 (2022).
7. Wang, L., Lin, T. T., Wang, K., and Hirayama, H.:
"Nonrelevant quantum levels limited laser dynamic in narrow-period terahertz quantum cascade lasers"
Japanese Journal of Applied Physics, pp. 102003 (2022).
8. Lin, T. T., Wang, L., Wang, K., Grange, T., Birner, S., and Hirayama, H.:
"Over one watt output power terahertz quantum cascade lasers by using high doping concentration and variable barrier-well height"
physica status solidi rrl, 15year of pss RRL, pp. 2200033 (2022).
9. Wang, L., Lin, T. T., Wang, K., and Hirayama, H.:
"Limitation of parasitic absorption in designs of three-state terahertz quantum cascade lasers with direct-phonon injection"
Applied Physics Express, pp. 052002 (2022).
10. Wang, L., Lin, T. T., Chen, M., Wang, K., and Hirayama, H.:
"Leakage suppression by isolating the desired quantum levels for high-temperature terahertz quantum cascade lasers"
Scientific Reports, pp. 23634 (2021).

Lab Members

Principal investigator

Hideki Hirayama: Team Leader

Core members

Li Wang: Research Scientist
TsungTse Lin: Visiting Scientist
Mingxi Chen: Student Trainee

Contact Information

Terahertz Research Building 304
519-1399 Aoba, Aramaki, Aoba-ku, Sendai, 980-0845, Japan
Tel: +81-(0)22-228-2035
Fax: +81-(0)22-228-2017
Email: hirayama [at] riken.jp