4.6 Article

Highly nonlinear organic crystal OHQ-T for efficient ultra-broadband terahertz wave generation beyond 10 THz

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OPTICS EXPRESS
卷 24, 期 10, 页码 -

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OPTICAL SOC AMER
DOI: 10.1364/OE.24.011054

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  1. National Research Foundation of Korea (NRF) Grants - Korean Government (MSIP) [2011-0017494, WCI 2011-001, 2013R1A2A2A01007232, 2014R1A5A1009799, 2009-0093826]
  2. National Research Foundation of Korea (NRF) Grants - Korean Government (Ministry of Education) [2011-0017494, WCI 2011-001, 2013R1A2A2A01007232, 2014R1A5A1009799, 2009-0093826]
  3. Center for Advanced Meta-Materials (CAMM) - Korea Government (MSIP) as Global Frontier Project [CAMM-2014M3A6B3063709]
  4. National Research Foundation of Korea [2013R1A2A2A01007232, WCI 2011-001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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We report on efficient generation of ultra-broadband terahertz (THz) waves via optical rectification in a novel nonlinear organic crystal with acentric core structure, i.e. 2-(4-hydroxystyryl)-1-methylquinolinium 4-methylbenzenesulfonate (OHQ-T), which possesses an ideal molecular structure leading to a maximized nonlinear optical response for near-infrared-pumped THz wave generation. By systematic studies on wavelength-dependent phase-matching conditions in OHQ-T crystals of different thicknesses we are able to generate coherent THz waves with a high peak-to-peak electric field amplitude of up to 650 kV/cm and an upper cut-off frequency beyond 10 THz. High optical-to-THz conversion efficiency of 0.31% is achieved by efficient index matching with a selective pumping at 1300 nm. (C) 2016 Optical Society of America

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