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Article

Broadband Anisotropic Optical Properties of the Terahertz Generator HMQ-TMS Organic Crystal

1
INFN-Section of Rome ’La Sapienza’, P.Le Aldo Moro, 2, 00185 Rome, Italy
2
Department of Physics, Sapienza University, P.le Aldo Moro, 5, 00185 Rome, Italy
3
Elettra–Sincrotrone Trieste S.C.p.A., S.S.14 km 163.5, Basovizza, 34149 Trieste, Italy
4
SBAI Department, Sapienza University, Via A. Scarpa, 14-00161 Rome, Italy
5
INFN-LNF, Via Enrico Fermi 40, 00044 Frascati (RM), Italy
*
Authors to whom correspondence should be addressed.
Condens. Matter 2020, 5(3), 47; https://doi.org/10.3390/condmat5030047
Received: 19 May 2020 / Revised: 6 July 2020 / Accepted: 11 July 2020 / Published: 14 July 2020
HMQ-TMS (2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 2,4,6-trimethylbenzenesulfonate) is a recently discovered anisotropic organic crystal that can be exploited for the production of broadband high-intensity terahertz (THz) radiation through the optical rectification (OR) technique. HMQ-TMS plays a central role in THz technology due to its broad transparency range, large electro-optic coefficient and coherence length, and excellent crystal properties. However, its anisotropic optical properties have not been deeply researched yet. Here, from polarized reflectance and transmittance measurements along the x 1 and x 3 axes of a HMQ-TMS single-crystal, we extract both the refraction index n and the extinction coefficient k between 50 and 35,000 cm 1 . We further measure the THz radiation generated by optical rectification at different infrared (IR) wavelengths and along the two x 1 and x 3 axes. These data highlight the remarkable anisotropic linear and nonlinear optical behavior of HMQ-TMS crystals, expanding the knowledge of its properties and applications from the THz to the UV region. View Full-Text
Keywords: terahertz; THz spectroscopy; optical indices; nonlinear effects; optical rectification; organic crystals; HMQ-TMS terahertz; THz spectroscopy; optical indices; nonlinear effects; optical rectification; organic crystals; HMQ-TMS
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MDPI and ACS Style

D’Arco, A.; Tomarchio, L.; Dolci, V.; Di Pietro, P.; Perucchi, A.; Mou, S.; Petrarca, M.; Lupi, S. Broadband Anisotropic Optical Properties of the Terahertz Generator HMQ-TMS Organic Crystal. Condens. Matter 2020, 5, 47. https://doi.org/10.3390/condmat5030047

AMA Style

D’Arco A, Tomarchio L, Dolci V, Di Pietro P, Perucchi A, Mou S, Petrarca M, Lupi S. Broadband Anisotropic Optical Properties of the Terahertz Generator HMQ-TMS Organic Crystal. Condensed Matter. 2020; 5(3):47. https://doi.org/10.3390/condmat5030047

Chicago/Turabian Style

D’Arco, Annalisa, Luca Tomarchio, Valerio Dolci, Paola Di Pietro, Andrea Perucchi, Sen Mou, Massimo Petrarca, and Stefano Lupi. 2020. "Broadband Anisotropic Optical Properties of the Terahertz Generator HMQ-TMS Organic Crystal" Condensed Matter 5, no. 3: 47. https://doi.org/10.3390/condmat5030047

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