Graphene based terahertz phase modulators
| dc.citation.epage | 8 | en_US |
| dc.citation.issueNumber | 3 | en_US |
| dc.citation.spage | 1 | en_US |
| dc.citation.volumeNumber | 5 | en_US |
| dc.contributor.author | Kakenov, N. | en_US |
| dc.contributor.author | Ergoktas, M. S. | en_US |
| dc.contributor.author | Balci, O. | en_US |
| dc.contributor.author | Kocabas, C. | en_US |
| dc.date.accessioned | 2019-02-21T16:03:44Z | |
| dc.date.available | 2019-02-21T16:03:44Z | |
| dc.date.issued | 2018 | en_US |
| dc.department | Department of Physics | en_US |
| dc.description.abstract | Electrical control of amplitude and phase of terahertz radiation (THz) is the key technological challenge for high resolution and noninvasive THz imaging. The lack of active materials and devices hinders the realization of these imaging systems. Here, we demonstrate an efficient terahertz phase and amplitude modulation using electrically tunable graphene devices. Our device structure consists of electrolyte-gated graphene placed at quarter wavelength distance from a reflecting metallic surface. In this geometry, graphene operates as a tunable impedance surface which yields electrically controlled reflection phase. Terahertz time domain reflection spectroscopy reveals the voltage controlled phase modulation of π and the reflection modulation of 50 dB. To show the promises of our approach, we demonstrate a multipixel phase modulator array which operates as a gradient impedance surface. | |
| dc.description.sponsorship | This work was supported by the European Research Council (ERC) Consolidator Grant No. ERC-682723 SmartGraphene and CK acknowledges BAGEP Award of the Science Academy. | |
| dc.identifier.doi | 10.1088/2053-1583/aabfaa | |
| dc.identifier.issn | 2053-1583 | |
| dc.identifier.uri | http://hdl.handle.net/11693/50131 | |
| dc.language.iso | English | |
| dc.publisher | IOP Publishing | |
| dc.relation.isversionof | https://doi.org/10.1088/2053-1583/aabfaa | |
| dc.relation.project | European Research Council, ERC: ERC-682723 - Bilim Akademisi | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.source.title | 2D Materials | en_US |
| dc.subject | electrolyte gating | en_US |
| dc.subject | Gradient phase surface | en_US |
| dc.subject | Graphene | en_US |
| dc.subject | Quarter wave surface | en_US |
| dc.subject | Terahertz phase | en_US |
| dc.subject | Tunable surface impedance | en_US |
| dc.title | Graphene based terahertz phase modulators | en_US |
| dc.type | Article | en_US |
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