Journal
DYES AND PIGMENTS
Volume 192, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109433
Keywords
Nonlinear optics; Organic crystals; Chromophores; THz wave generation
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning, Korea [2021R1A5A6002853, 2021R1A2C1005012, 2019K1A3A1A14057973, 2019R1A2C3003504, 2020R1A4A2002828]
- Swiss National Science Foundation (SNSF), Switzerland [IZKSZ2_188194]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2019R1I1A2A01058066]
- National Research Foundation of Korea [2021R1A2C1005012, 2019R1I1A2A01058066, 2019K1A3A1A14057973] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, new organic benzothiazolium crystals with very large off-diagonal optical nonlinearity were developed. The PMB-TFO and PMB-BTS crystals exhibit state-of-the-art off-diagonal effective hyperpolarizability due to the V-shape and X-shape alignments of PMB chromophores, showing excellent characteristics for second-order nonlinear optical applications.
In this study, we develop new organic benzothiazolium crystals possessing very large off-diagonal optical nonlinearity. In these crystals, benzothiazolium-based 2-(4-(4-(hydroxymethyl)piperidin-1-yl)styryl)-3-methyl-benzothiazol-3-ium (PMB) cations with large molecular optical nonlinearity are incorporated with two anions: 4-(trifluoromethoxy)benzenesulfonate (TFO) with an orthogonal non-planar shape and 5-bromothiophene-2-sulfonate (BTS) with a planar shape. Both PMB-TFO and PMB-BTS crystals exhibit state-of-the-art off-diagonal effective hyperpolarizability (similar to 105 x 10(-30) esu) that results from the V-shape and X-shape alignments of PMB chromophores, respectively. Newly developed PMB crystals indicate excellent characteristics for second-order nonlinear optical applications such as difference-frequency generation (e.g. optical rectification) and sum-frequency generation (e.g. second-harmonic generation), which are comparable to current benchmark organic crystals.
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