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Highly Efficient Organic THz Generator Pumped at Near‐Infrared: Quinolinium Single Crystals
Author(s) -
Kim PilJoo,
Jeong JaeHyeok,
Jazbinsek Mojca,
Choi SooBong,
Baek InHyung,
Kim JongTaek,
Rotermund Fabian,
Yun Hoseop,
Lee Yoon Sup,
Günter Peter,
Kwon OPil
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201101458
Subject(s) - acentric factor , materials science , terahertz radiation , optoelectronics , infrared , malononitrile , nonlinear optics , analytical chemistry (journal) , optics , crystallography , organic chemistry , laser , physics , chemistry , catalysis
A novel highly efficient ionic electro‐optic quinolinium single crystals for THz wave applications is reported. Acentric quinolinium derivatives, HMQ‐T (2‐(4‐hydroxy‐3‐methoxystyryl)‐1‐methylquinolinium 4‐methylbenzenesulfonate) and HMQ‐MBS (2‐(4‐hydroxy‐3‐methoxystyryl)‐1‐methylquinolinium 4‐methoxybenzenesulfonate) exhibit high order parameters cos 3 θ p = 0.92 and cos 3 θ p = 1.0, respectively, as well as a large macroscopic optical nonlinearity, which is in the range of the benchmark stilbazolium DAST ( N,N ‐dimethylamino‐ N ’‐methylstilbazolium 4‐methylbenzenesulfonate) and phenolic polyene OH1 (2‐(3‐(4‐hydroxystyryl)‐5,5‐dimethylcyclohex‐2‐enylidene)malononitrile) crystals. As‐grown unpolished bulk HMQ‐T crystals with a side length of about 6 mm and thickness of 0.56 mm exhibit 3.1 times higher THz generation efficiency than 0.37 mm thick OH1 crystals and about 8.4 times higher than 1 mm thick inorganic standard ZnTe crystals at the near‐infrared fundamental wavelength of 836 nm. Therefore, HMQ crystals with high order parameter obviously have a very high potential for high power THz‐wave generation and its applications.