Widely tunable broadband terahertz radiation generation using a configurationally locked polyene 2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene] malononitrile crystal via difference frequency generation

Uchida, Hirohisa; Tripathi, Saroj R.; Suizu, Koji; Sakamoto, Takayuki; Osumi, Takashi; Kawase, Kodo

doi:10.1007/s00340-013-5362-0

Cited by 32 publications

(29 citation statements)

References 26 publications

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Section: Introductionmentioning

confidence: 99%

“…Organic electro‐optic crystals are highly interesting materials for intense broadband terahertz (THz) wave generation with an extremely high optical‐to‐THz conversion efficiency . Using nonlinear optical conversion processes, such as optical rectification and difference frequency generation, organic electro‐optic crystals can generate very large THz electric fields exceeding 10 MV m −1 . Compared with well‐known inorganic counterparts (e.g., ZnTe and GaP) for collinear interaction, organic crystals primarily exhibit a higher figure of merit (FOM) for THz wave generation due to the considerably larger optical nonlinearity combined with good phase‐matching possibilities .…”

Section: Introductionmentioning

confidence: 99%

“…Benchmark electro‐optic organic crystals used previously as efficient THz sources have been primarily based on red‐ or orange‐colored nonlinear optical chromophores. This is because, in general, the microscopic optical nonlinearity of push–pull‐type chromophores increases with increasing the π‐conjugation length and the strength of electron donor and acceptor groups, based among others on the decreased bandgap between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of the chromophore.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with red‐ or orange‐colored chromophores used in benchmark organic electro‐optic crystals, such as DAST 4‐(4‐( N,N ‐dimethylamino)styryl)‐1‐methylpyridinium 4‐methylbenzenesulfonate), DSTMS 4‐(4‐( N,N ‐dimethylamino)styryl)‐1‐methylpyridinium 2,4,6‐trimethylbenzenesulfonate), OH1 (2‐(3‐(4‐hydroxystyryl)‐5,5‐dimethylcyclohex‐2‐enylidene)malononitrile), and HMQ‐T (2‐(4‐hydroxy‐3‐methoxystyryl)‐1‐methylquinolinium 4‐methylbenzenesulfonate), yellow‐colored chromophores possess significantly different absorption and refraction properties. Therefore, using yellow‐colored chromophores may provide various advantages for intense THz wave generation, e.g., different and even better phase‐matching possibilities when pumped at different wavelengths in diverse configurations along with the wider transparency range.…”

Section: Introductionmentioning

confidence: 99%

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Yellow‐Colored Electro‐Optic Crystals as Intense Terahertz Wave Sources

Jeong

Kang

Lee

et al. 2018

Adv Funct Materials

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This study presents newly developed yellow-colored organic electro-optic crystals to provide high terahertz (THz) wave generation efficiency. Compared with currently existing red-or orange-colored electro-optic crystals, which are used for most benchmark organic THz sources, yellow-colored crystals have additional superior advantages for THz wave generation, e.g., higher transparency in the visible wavelength range with accompanying different phase-matching possibilities. The new yellow-colored crystals consist of a highly nonlinear optical 4-(4-hydroxystyryl)-1-methylpyridinium (OHP) cation, with a relatively short wavelength of maximal absorption at 390 nm in solution, and various halogen-substituted benzenesulfonate anions, with strong secondary-bonding ability. OHP 4-chlorobenzenesulfonate (OHP-CBS) crystals exhibit large off-resonant macroscopic optical nonlinearity and high transparency, with a cut-off wavelength for solid-state absorption near 490 nm. OHP-CBS crystals provide excellent THz wave generation characteristics based on optical rectification. A 0.53 mm thick OHP-CBS crystal delivers ≈27 times higher optical-to-THz conversion efficiency and a much broader spectrum bandwidth compared with the standard 1.0 mm thick ZnTe at 1300 nm pumping. Particularly, compared with a benchmark organic quinolinium crystal with a similar thickness of 0.55 mm, OHP-CBS crystals exhibit 1.7 times higher optical-to-THz conversion efficiency, and show a significantly different THz spectral shape.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Yellow‐Colored Electro‐Optic Crystals as Intense Terahertz Wave Sources

Jeong

Kang

Lee

et al. 2018

Adv Funct Materials

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“…15 The required thickness of electro-optic crystals is mostly in the range of 0.1-1 mm depending on the group and phase velocity matching between pump and THz waves in nonlinear frequencyconversion processes such as difference-frequency generation (DFG) and optical rectification (OR). 10,11,30,31 The aim of the present work is to develop a crystal engineering technique achieving as-grown benchmark electro-optic crystals possessing a plan-parallel plate shape with a large area exceeding 65 mm 2 and thickness in the range of 0.1-1 mm. Figure 1b shows a schematic illustration of the crystal growth method we employed for obtaining crystals appropriate for efficient THz photonic applications.…”

mentioning

confidence: 99%