Integrated optics spiral photoconductive antennas coupled with 1D and 2D micron-size terahertz-wavelength plasmonic metal arrays

Terahertz (THz) photoconductive antenna (PCA) emitters having one-dimensional (1D) and two-dimensional (2D) micron-size metal line arrays (MLA's) at the transmission side of the semi-insulating GaAs substrate were fabricated via UV photolithography and electron beam deposition. At a fluence of...

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Bibliographic Details
Published inOptical materials express Vol. 12; no. 4; p. 1617
Main Authors Bardolaza, H. R., Cabello, N. I. F., Ferrolino, J. P. R., Verona, I. C. M., Bacaoco, M. Y., Somintac, A. S., Salvador, A. A., De Los Reyes, A. E., Estacio, E. S.
Format Journal Article
LanguageEnglish
Published Washington Optical Society of America 01.04.2022
Subjects
Antenna arrays
Electron beams
Emitters
Fluence
Integrated optics
Metamaterials
Photolithography
Spiral antennas
Substrates
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Summary:Terahertz (THz) photoconductive antenna (PCA) emitters having one-dimensional (1D) and two-dimensional (2D) micron-size metal line arrays (MLA's) at the transmission side of the semi-insulating GaAs substrate were fabricated via UV photolithography and electron beam deposition. At a fluence of ∼1.2 mJ/cm 2 and 20 V PP bias, the enhancement in the THz signal peak-to-peak amplitudes are ∼6 times for 1D MLA and ∼11 times for 2D MLA, compared to the reference PCA, respectively. An all-optical effect via THz extraordinary transmission is conjectured for the enhancement mechanism. This metamaterial PCA design presents a feasible, yet more cost-effective alternative to photo-conducting gap nanostructure fabrication using e-beam lithography.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.455044