Conference paper
Linear and nonlinear properties of chalcogenide glasses in the terahertz frequency
Department of Photonics Engineering, Technical University of Denmark1
Metamaterials, Department of Photonics Engineering, Technical University of Denmark2
National R&D Institute for Optoelectronics3
Teraherts Technologies and Biophotonics, Department of Photonics Engineering, Technical University of Denmark4
Terahertz (THz) waves have the potential to improve a wide range of devices in the space, defense and semiconductor industries as well as offering the possibility of investigating various molecules of interest in biology, medicine, art etc. For this reason, THz sources, detectors and passive linear components have greatly been developed in recent years.
However there is still no any non-linear device available. This is mainly due to the lack of the rigorous investigation of non-linear characteristics of materials in the THz range. We chose to investigate chalcogenide glasses due to their high nonlinear coefficients in the optical range, which might suggest pronounced nonlinear behavior also at THz frequencies.
Here we present measurements, both linear and nonlinear, of As2S3 and As2Se3. For the linear measurements we employed a combination of THz time-domain spectroscopy setups. In the low frequency range we used a standard THz-TDS setup based on photoconductive switches while in the higher frequency domain we used an air biased coherent detection (ABCD) setup.
This allowed for a wide frequency range (from 0.2 to 18 THz) investigation of the refractive index of the glasses. The nonlinear coefficient in the THz range was investigated using a lithium niobate based setup that allows us to reach electrical field strength exceeding 400 kV/cm. Results from both investigations will be presented during the talk.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2014 |
| Pages: | 1-2 |
| Proceedings: | 16th International Conference on Transparent Optical Networks |
| ISBN: | 1479956015 , 1479956023 , 9781479956012 and 9781479956029 |
| ISSN: | 21612064 and 21612056 |
| Types: | Conference paper |
| DOI: | 10.1109/ICTON.2014.6876467 |
| ORCIDs: | Malureanu, Radu , Lavrinenko, Andrei and Jepsen, Peter Uhd |
Air biased coherent detection setup Arsenic compounds As(role bin) As2(role bin) As2S3(role bin) As2Se3(role bin) As<sub>2</sub>S<sub>3</sub> As<sub>2</sub>Se<sub>3</sub> Chalcogenide glasses Communication, Networking and Broadcast Technologies Components, Circuits, Devices and Systems Electrical field strength Engineered Materials, Dielectrics and Plasmas Frequency 0.2 THz to 18 THz Frequency-domain analysis Glass Li(role ss) LiNbO3(role ss) LiNbO<sub>3</sub> Linear properties Lithium niobate Nb(role ss) NbO3(role ss) Nonlinear coefficient Nonlinear properties O(role ss) O3(role ss) Photoconducting switches Photoconductive switches Photonics Photonics and Electrooptics Refractive index Resonant frequency S(role bin) S3(role bin) Se(role bin) Se3(role bin) Spectroscopy THz spectroscopy THz time-domain spectroscopy Terahertz frequency Terahertz wave spectra frequency 2.0E+11 1.8E+13 Hz
