Ultra-short pulse generation by a topological insulator based saturable absorber
Hunan University · Xiangtan University · +1 more institution
Abstract
Under strong laser radiation, a Dirac material, the topological insulator (TI) Bi2Te3, exhibits an optical transmittance increase as a result of saturable absorption. Based on an open-aperture Z-scan measurement at 1550 nm, we clearly show that the TI, Bi2Te3 under our investigation, is indeed a very-high-modulation-depth (up to 95%) saturable absorber. Furthermore, a TI based saturable absorber device was fabricated and used as a passive mode locker for ultrafast pulse formation at the telecommunication band. This contribution unambiguously shows that apart from its fantastic electronic property, a TI (Bi2Te3) may also possess attractive optoelectronic property for ultrafast photonics.
Citation impact
- FWCI
- 29.25
- Percentile
- 100%
- References
- 40
Authors
7Topics & keywords
- Saturable absorption
- Topological insulator
- Pulse (music)
- Optoelectronics
- Insulator (electricity)
- Materials science
- Physics
- Optics