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Proceedings Paper

Monolithic echoless photoconductive switches for high-resolution terahertz time-domain spectroscopy (Conference Presentation)
Author(s): Kenneth Maussang; José Palomo; Jean-Michel Manceau; Raffaele Colombelli; Isabelle Sagnes; Lianhe H. Li; Edmund H. Linfield; Giles A. Davies; Juliette Mangeney; Jerome Tignon; Sukhdeep Dhillon

Paper Abstract

Interdigitated photoconductive (iPC) switches [1] are powerful and convenient devices for time-resolved spectroscopy, with the ability to operate both as sources and detectors of terahertz (THz) frequency pulses. However, reflection of the emitted or detected radiation within the device substrate itself can lead to echoes that inherently limits the spectroscopic resolution achievable from their use in time-domain spectroscopy (TDS) systems. In this work, we demonstrate a design of low-temperature-grown-GaAs (LT-GaAs) iPC switches for THz pulse detection that suppresses such unwanted echoes [2]. This is realized through the growth of a buried multilayer LT-GaAs structure that retains its ultrafast properties, which after wafer bonding to a metal-coated host substrate, results in an iPC switch with a metal plane buried at a subwavelength depth below the LT-GaAs surface. Using this device as a detector, and coupling it to an echo-less iPC source [3], enables echo-free THz-TDS and high-resolution spectroscopy, with a resolution limited only by the temporal length of the measurement governed by the mechanical delay line used. As a proof-of-principle, the 2(12)-2(21) and the 1(01)-2(12) rotational lines of water vapor have been spectrally resolved, demonstrating a spectral resolution below 10 GHz. [1] A. Dreyhaupt, S. Winnerl, T. Dekorsy, M. Helm, Appl. Phys. Lett. 86, 121114 (2005) [2] K. Maussang, J. Palomo, J.-M. Manceau, R. Colombelli, I. Sagnes, L. H. Li, E. H. Linfield, A. G. Davies, J. Mangeney, J. Tignon, and S. S. Dhillon, Appl. Phys. Lett. 110, 141102 (2017). [3] K. Maussang, A. Brewer, J. Palomo, J.-M. Manceau, R. Colombelli, I. Sagnes, J. Mangeney, J. Tignon, S.S. Dhillon, IEEE Trans. Terahertz Sci. Technol. 6, 20 (2016)

Paper Details

Date Published: 14 March 2018
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Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 1054022 (14 March 2018); doi: 10.1117/12.2287878
Show Author Affiliations
Kenneth Maussang, Lab. Pierre Aigrain (France)
José Palomo, Lab. Pierre Aigrain (France)
Jean-Michel Manceau, Ctr. de Nanosciences et de Nanotechnologies (France)
Raffaele Colombelli, Ctr. de Nanosciences et de Nanotechnologies (France)
Isabelle Sagnes, Ctr. de Nanosciences et de Nanotechnologies (France)
Lianhe H. Li, Univ. of Leeds (United Kingdom)
Edmund H. Linfield, Univ. of Leeds (United Kingdom)
Giles A. Davies, Univ. of Leeds (United Kingdom)
Juliette Mangeney, Lab. Pierre Aigrain (France)
Jerome Tignon, Lab. Pierre Aigrain (France)
Sukhdeep Dhillon, Lab. Pierre Aigrain (France)


Published in SPIE Proceedings Vol. 10540:
Quantum Sensing and Nano Electronics and Photonics XV
Manijeh Razeghi; Gail J. Brown; Jay S. Lewis; Giuseppe Leo, Editor(s)

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