Ultrafast nonlinear transparency driven at a telecom wavelength in an organic semiconductor system
| Autor: | Ruth Shinar, Joseph Shinar, Zhaoyu Liu, Jigang Wang, Liang Luo, Fadzai Fungura, Di Cheng, Joong Mok Park, Aaron Patz, Kai-Ming Ho |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Band gap business.industry General Physics and Astronomy Physics::Optics 02 engineering and technology Photon energy 021001 nanoscience & nanotechnology Laser 01 natural sciences lcsh:QC1-999 law.invention Optical pumping Optical modulator law 0103 physical sciences Femtosecond 0210 nano-technology Telecommunications business Absorption (electromagnetic radiation) Ultrashort pulse lcsh:Physics |
| Zdroj: | AIP Advances, Vol 9, Iss 2, Pp 025303-025303-5 (2019) |
| ISSN: | 2158-3226 |
| Popis: | Ultrafast laser-induced transparency is demonstrated using femtosecond (fs) pump-probe experiments in the organic P3HT:PCBM (donor:acceptor) blend structure. For above band gap pumping, ultrafast transient signals strongly depend on the probe photon energy. Most intriguingly, for below band gap pumping at 0.95 eV, or 1.3 µm at a telecom wavelength, a huge transmission increase up to 30% only during the laser pulse ∼100 fs is observed as a pump-driven, quasi-instantaneous suppression of absorption for the high photon-energy energy probe beam. We attribute the observed laser-driven transparency to dynamic Franz-Keldysh effect, at least one order of magnitude stronger compared to the multiphoton nonlinearities. Our results may be used for development of low-cost, beyond 100 Gbit/s optical switching devices. |
| Databáze: | OpenAIRE |
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