Photo-induced reduction of graphene oxide coating on optical waveguide and consequent optical intermodulation
| Autor: | Y. K. Yap, R.M. De La Rue, Wu Yi Chong, W. H. Lim, Hafeez Ahmad, Choon Kong Lai |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Multidisciplinary
Materials science business.industry Physics::Optics Pulse duration Optical power 02 engineering and technology Polarizer 021001 nanoscience & nanotechnology 01 natural sciences Optical switch Waveguide (optics) Article law.invention 010309 optics Wavelength Optical modulator law 0103 physical sciences Optoelectronics 0210 nano-technology business Telecommunications Absorption (electromagnetic radiation) |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | Increased absorption of transverse-magnetic (TM) - polarised light by a graphene-oxide (GO) coated polymer waveguide has been observed in the presence of transverse-electric (TE) - polarised light. The GO-coated waveguide exhibits very strong photo-absorption of TE-polarised light - and acts as a TM-pass waveguide polariser. The absorbed TE-polarised light causes a significant temperature increase in the GO film and induces thermal reduction of the GO, resulting in an increase in optical-frequency conductivity and consequently increased optical propagation loss. This behaviour in a GO-coated waveguide gives the action of an inverted optical switch/modulator. By varying the incident TE-polarised light power, a maximum modulation efficiency of 72% was measured, with application of an incident optical power level of 57 mW. The GO-coated waveguide was able to respond clearly to modulated TE-polarised light with a pulse duration of as little as 100 μs. In addition, no wavelength dependence was observed in the response of either the modulation (TE-polarised light) or the signal (TM-polarised light). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|