Electrically controlled terahertz spatial light modulators with graphene arrays

Date

2016-05-27

Author

Kakenov, Nurbek
Takan, Taylan
Özkan, Vedat Ali
Balci, Osman
Polat, Emre O.
Altan, Hakan
KOCABAŞ, COŞKUN

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

194
views

0
downloads

Gate-tunable high-mobility electrons on atomically thin graphene layers provide a unique opportunity to control electromagnetic waves in a very broad spectrum. In this paper, we describe an electrically-controlled multipixel terahertz light modulators. The spatial light modulator is fabricated using two large-area graphene layers grown by chemical vapor deposition and transferred on THz transparent and flexible substrates. Room temperature ionic liquid, inserted between the graphene, provides mutual gating between the graphene layers. We used passive matrix addressing to control local charge density thus the THz transmittance. With this device configuration, we were able to obtain 5x5 arrays of graphene modulator with 65% modulation between 0.1 to 1.5 THz.

Subject Keywords

Graphene, THz modulator, Active THz devices

URI

https://hdl.handle.net/11511/54963

Conference Name

IEEE MTT-S International Microwave Symposium (IMS)

Collections

Department of Physics, Conference / Seminar

Suggestions

OpenMETU
Core

Femtosecond laser written waveguides deep inside silicon Pavlov, Ihor; Pavlova, S.; Kadan, V.; Makey, G.; Turnali, A.; Yavuz, O.; Ilday, F. O. (2017-08-01) Photonic devices that can guide, transfer, or modulate light are highly desired in electronics and integrated silicon (Si) photonics. Here, we demonstrate for the first time, to the best of our knowledge, the creation of optical waveguides deep inside Si using femtosecond pulses at a central wavelength of 1.5 mu m. To this end, we use 350 fs long, 2 mu J pulses with a repetition rate of 250 kHz from an Er-doped fiber laser, which we focused inside Si to create permanent modifications of the crystal. The pos...
Electrochromic properties of multicolored novel polymer synthesized via combination of benzotriazole and N-functionalized 2,5-di(2-thienyl)-1H-pyrrole units Rende, Eda; Kilic, Cihan E.; Udum, Yasemin Arslan; Toffoli, Daniele; Toppare, Levent Kamil (2014-08-20) Synthesis of new conducting polymers is desired since their electrochemical and optical properties enable them to be used as active layers in many device applications. Benzotriazole and N-functionalized 2,5-di(2-thienyl)-1H-pyrrole (SNS Series) containing polymers showed very promising results as electrochromic materials. In order to observe the effect of the combination of these two units, three new monomers; 2-(6-(2,5-bis(5-methylthiophen-2-yl)-1H-pyrrol-1-yl)hexyl)-4,7-di(thiophen-2-yl)-2H benzo[d][1,2,3...
Broadband THz Modulators Based on Multilayer Graphene on PVC KAYA, Emine; Kakenov, Nurbek; Kocabas, Coskun; Altan, Hakan; Esentürk, Okan (2016-09-30) In this study we present the direct terahertz timedomain spectroscopic measurement of CVD-grown multilayer graphene (MLG) on PVC substrate with an electrically tunable Fermi level. In a configuration consisting MLG and injected organic dopant, the transmitted intensity loss of terahertz radiation was observed with an applied voltage between 0 and 3.5 V.We showed that MLG on PVC devices provided approximately 100 % modulation between 0.2 and 1.5 THz at preferentially low operation voltage of ca. 3V. The obse...
Ensemble monte carlo simulation of quantum well infrared photodetectors, and inp based long wavelength quantum well infrared photodetectors for thermal imaging Cellek, Oray Orkun; Beşikci, Cengiz; Department of Electrical and Electronics Engineering (2006) Quantum well infrared photodetectors (QWIP) utilize quantum wells of large bandgap materials to detect infrared radiation. When compared to conventional low bandgap LWIR photodetectors, the QWIP technology offers largest format thermal imagers with much better uniformity. The theoretical part of this study includes the development of a QWIP ensemble Monte Carlo simulator. Capture paths of electrons to quantum wells are simulated in detail. For standard AlGaAs/GaAs QWIPs, at medium and high E-fields L valley...
Comparison of crystal Si solar cells fabricated on p-type and n-type float zone silicon wafers Bilgen, Makbule; Turan, Raşit; Department of Physics (2013) Solar cells are traditionally fabricated on p-type Si substrates due to the high electron diffusion length in p-type substrate. However, high quality float zone silicon wafers provide higher carrier life time for holes in the n-type substrates, making it possible to fabricate high efficiency solar cells in this type of substrate. Superior properties of n-type substrates have created a tendency towards fabrication of n-type solar cells in photovoltaic market technology considerably. It is even forecasted tha...

Citation Formats

N. Kakenov et al., “Electrically controlled terahertz spatial light modulators with graphene arrays,” presented at the IEEE MTT-S International Microwave Symposium (IMS), San Francisco, CA, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/54963.