Broadband terahertz modulators using self-gated graphene capacitors

Download

index.pdf

Date

2015-09-01

Author

Kakenov, Nurbek
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

25
views

0
downloads

We demonstrate a terahertz intensity modulator using a graphene supercapacitor which consists of two large-area graphene electrodes and an electrolyte medium. The mutual electrolyte gating between the graphene electrodes provides very efficient electrostatic doping with Fermi energies of 1 eV and a charge density of 8 x 10(13) cm(-2). We show that the graphene supercapacitor yields more than 50% modulation between 0.1 and 1.4 THz with operation voltages less than 3 V. The low insertion losses, high modulation depth over a broad spectrum, and the simplicity of the device structure are the key attributes of graphene supercapacitors for THz applications. (C) 2015 Optical Society of America

Subject Keywords

METAMATERIALS, TRANSITIONS, DEVICES, ARRAYS

URI

https://hdl.handle.net/11511/45692

Journal

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

DOI

https://doi.org/10.1364/josab.32.001861

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Perfect metamaterial absorber-based energy harvesting and sensor applications in the industrial, scientific, and medical band Bakir, Mehmet; KARAASLAN, MUHARREM; Dincer, Furkan; DELİHACIOĞLU, KEMAL; Sabah, Cumali (2015-09-01) An electromagnetic (EM) energy harvesting application based on metamaterials is introduced. This application is operating at the the industrial, scientific, and medical band (2.40 GHz), which is especially chosen because of its wide usage area. A square ring resonator (SRR) which has two gaps and two resistors across the gaps on it is used. Chip resistors are used to deliver the power to any active component that requires power. Transmission and reflection characteristics of the metamaterial absorber for en...
Electric dipole moments of charged leptons and lepton flavor violating interactions in the general two Higgs doublet model Iltan, EO (American Physical Society (APS), 2001-07-01) We calculate the electric dipole moment of the electron using the experimental result of the muon electric dipole moment and upper limit of the BR(mu-->e gamma) in the framework of the general two Higgs doubler model. Our prediction is 10(-32) e cm, which lies in the experimental current limits. Further, we obtain constraints for the Yukawa couplings )over bar>(D)(N,taue) and )over bar>(D)(N,tau mu). Finally, we present an expression which connects the BR(tau-->mu gamma) and the electric dipole moment of th...
Electric dipole moments of charged leptons in the split fermion scenario in the two Higgs doublet model Iltan, EO (Springer Science and Business Media LLC, 2005-11-01) We predict the charged lepton electric dipole moments in the split fermion scenario in the framework of the two Higgs doublet model. We observe that the numerical value of the muon (tau) electric dipole moment is of the order of the magnitude of 10(-22) e cm (10(-20) e cm) and there is an enhancement in the case of two extra dimensions, especially for the tau lepton electric dipole moment.
Optimized Electromagnetic Harvester with a Non-Magnetic Inertial Mass Ulusan, Hasan; Yasar, Oguz; Zorlu, Ozge; Külah, Haluk (2015-09-09) This paper presents an optimization study to decrease the operation frequency and increase the output power of a miniature electromagnetic (EM) energy harvester, by incorporating a non-magnetic inertial mass together with the moving magnet. The harvester coil position has been optimized through FEM, and validated through tests. Experimental studies on the inertial mass showed that increasing the magnet size further increases the resonance frequency due to the increased magnetic forces. Conversely, using a n...
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...

Citation Formats

N. Kakenov, O. Balci, E. O. Polat, H. Altan, and C. KOCABAŞ, “Broadband terahertz modulators using self-gated graphene capacitors,” JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, pp. 1861–1866, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/45692.