Terahertz radiation enhancement in dipole photoconductive antenna on LT-GaAs using a gold plasmonic nanodisk array

Journal article (2019)

Authors

Mohammad Bashirpour University of Tehran
Jafar Poursafar University of Tehran
M Kolahdouz University of Tehran
Mohsen Hajari University of Tehran
Matin Forouzmehr University of Tehran
Mohammad Neshat University of Tehran
Hamid Hajihoseini University of Iceland
Morteza Fathipour University of Tehran
Z. Koladouz Esfahani Electronic Components, Technology and Materials - EEMCS
Kouchi Zhang Electronic Components, Technology and Materials - EEMCS
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
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Published Date

2019

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

This study proposes a new-fashioned plasmonic photoconductive antenna (PCA) with high optical-to-terahertz (THz) conversion efficiency. Finite element method was used to investigate and optimize the interaction of 800 nm femtosecond laser with the designed nanodisk array in the antenna's gap using its geometrical parameters. According to the simulation results, our optimized nanoplasmonic structure showed more than 38% enhancement in the absorption efficiency compared to the conventional structure without any nanostructure. Measuring the THz radiation of the fabricated PCAs using a time domain spectroscopy setup exhibited an exceptional 5.6 times higher electric field in 0.1–2.5 THz range compared to a similar PCA but without nanoplasmonic structure.