Wavelength conversion through plasmon-coupled surface states
Abstract
Surface states generally degrade semiconductor device performance by raising the charge injection barrier height, introducing localized trap states, inducing surface leakage current, and altering the electric potential. We show that the giant built-in electric field created by the surface states can be harnessed to enable passive wavelength conversion without utilizing any nonlinear optical phenomena. Photo-excited surface plasmons are coupled to the surface states to generate an electron gas, which is routed to a nanoantenna array through the giant electric field created by the surface states. The induced current on the nanoantennas, which contains mixing product of different optical frequency components, generates radiation at the beat frequencies of the incident photons. We utilize the functionalities of plasmon-coupled surface states to demonstrate passive wavelength conversion of nanojoule optical pulses at a 1550 nm center wavelength to terahertz regime with efficiencies that exceed nonlinear optical methods by 4-orders of magnitude.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 30, 2021
- Source ID
- 10.1038/s41467-021-24957-1
Entities
People
- Deniz Turan
- Jigang Wang
- Joong-mok Park
- Liang Luo
- Mona Jarrahi
- Nezih Tolga Yardimci
- Ping Keng Lu
- Sascha Preu
- Uttam Nandi
- Zhaoyu Liu
Organizations
- Office of Naval Research