Broadband THz pulses have been generated in 2-[3-(4- hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene]malononitrile (OH1) by optical rectification of sub-picosecond laser pulses. We show that OH1 crystals allow velocity-matched generation and detection frequencies the whole range between 0.3 2.5 for a pump wavelength from 1200 to 1460 nm. higher figure merit optimized compared benchmark inorganic semiconductor ZnTe GaAs organic ionic salt crystal 4-N,N-dimethylamino-4'-N'-methyl stilbazolium...

Abstract We investigate a configurationally locked polyene (CLP) crystal 2‐(3‐(4‐hydroxystyryl)‐5,5‐dimethylcyclohex‐2‐enylidene)malononitrile (OH1) containing phenolic electron donor, which also acts as hydrogen bond donor. The OH1 crystals with orthorhombic space group Pna2 1 (point mm2) exhibit large second‐order nonlinear optical figures of merit, high thermal stability and very favorable growth characteristics. Higher solubility in methanol larger temperature difference between the...

The high-power broadband terahertz (THz) generator is an essential tool for a wide range of THz applications. Here, we present novel highly efficient electro-optic quinolinium single crystal wave generation. For obtaining intense and waves by optical-to-THz frequency conversion, was developed to fulfill all the requirements, which are in general extremely difficult maintain simultaneously medium, such as large macroscopic response excellent characteristics including size with desired facets,...

Abstract A novel highly efficient ionic electro‐optic quinolinium single crystals for THz wave applications is reported. Acentric derivatives, HMQ‐T (2‐(4‐hydroxy‐3‐methoxystyryl)‐1‐methylquinolinium 4‐methylbenzenesulfonate) and HMQ‐MBS 4‐methoxybenzenesulfonate) exhibit high order parameters cos 3 θ p = 0.92 1.0, respectively, as well a large macroscopic optical nonlinearity, which in the range of benchmark stilbazolium DAST ( N,N ‐dimethylamino‐ N ’‐methylstilbazolium phenolic polyene OH1...

Abstract This study reports a new nonfullerene electron transporting material (ETM) based on naphthalene diimide (NDI) small molecules for use in high‐performance perovskite solar cells (PSCs). These simultaneously achieve high power conversion efficiency (PCE) of over 20% and long‐term stability. New NDI‐ID ( N , N′ ‐Bis(1‐indanyl)naphthalene‐1,4,5,8‐tetracarboxylic diimide) consisting an ‐substituted indane group having simultaneous alicyclic aromatic characteristics is synthesized by...

During the past decade, various new types of organic nonlinear optical crystals have been developed to overcome benchmark stilbazolium DAST (4-(4-(N,N-dimethylamino)styryl)-1-methylpyridinium 4-methylbenzenesulfonate) crystal. Here, we review acentric core structures used in recently exhibiting high macroscopic second-order nonlinearity, along with their supramolecular interactions and THz applications. The such as neutral CLP (configurationally locked polyene based on phenyltriene), ionic...

Abstract Organic π‐conjugated crystals with second‐order optical nonlinearity are considerably attractive materials for diverse terahertz (THz) wave photonics. An overview of the research organic nonlinear (NLO) THz generation, detection, and applications is provided here. First, status NLO compared to other alternative described. Second, basic theory requirements generators detectors explained. Third, a primary focus on that have been developed during last decade, various molecular...

Highly efficient and thermally stable inverted MAPbI₃ FAPbI_3−xBr<italic>x</italic> perovskite planar solar cells are demonstrated by using a <italic>N</italic>,<italic>N</italic>′-bis(phenylmethyl)naphthalene-1,4,5,8-tetracarboxylicdiimide (NDI-PM)-based electron transporting material (ETM) instead of conventional PCBM-based ETM.

Highly efficient nonlinear optical organic crystals are very attractive for various photonic applications including terahertz (THz) wave generation. Up to now, only two classes of ionic based on either pyridinium or quinolinium with extremely large macroscopic nonlinearity have been developed. This study reports a new class introducing electron-accepting benzothiazolium, which exhibit higher electron-withdrawing strength than and in benchmark crystals. The benzothiazolium consisting acentric...

We report on the generation of continuously tunable multi-cycle THz pulses with center frequencies from 0.3 to 0.8 in organic nonlinear crystal, HMQ-TMS [2-(4-hydroxy-3-methoxystyryl)-1-methylquinolinium 2,-4,-6-trimethylbenzenesulfonate], by collinearly phase matched optical rectification temporally shaped 800 nm pulses. The harmonic frequency components inherent pulse shaper is selectively suppressed varying crystal thickness. generated show up 20 times higher energies compared benchmark...

Organic electrooptic crystals based on a new acentric core structure 2-(4-hydro­xystyryl)-1-methylquinolinium provide optimal molecular packing for maximizing the response. They allow intense broadband terahertz generation with over 30 times higher efficiency compared to widely used inorganic ZnTe. As service our authors and readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized online delivery, but not copy-edited or...

Abstract Since its first demonstration in 1995, terahertz time‐domain imaging has attracted an increasingly growing interest for ability to reveal spectral fingerprints of materials and probe changes refractive index absorption, as well detect the inner structure complex objects via time‐of‐flight measurements. Practically, however, widespread use been hampered by very long acquisition time typically required spatially raster‐scan object, each spatial point, record field a delay line. Here,...

A series of nonlinear optical chromophores based on configurationally locked polyene are synthesized, and the single crystal growth from melt investigated. The consist a π-conjugated hexatriene bridge between dialkylamino or methoxy electron donors dicyanomethylidene acceptor. physical properties X-ray structures these characterized. Specifically, chromophore 2-{3-[2-(4-dimethylaminophenyl)vinyl]-5,5-dimethylcyclohex-2-enylidene}malononitrile (DAT2) exhibits strong powder second-harmonic...

We have developed a new cation core structure, N-benzyl stilbazolium nonlinear optical chromophore with non-polar benzyl group to achieve acentric molecular ordering in the crystalline state. New crystal, BP3 (N,N-dimethylamino-N′-2,5-dimethylbenzyl-stilbazolium p-toluenesulfonate), exhibits an crystal structure monoclinic P21 phase large macroscopic nonlinearity of 540 times powder second harmonic generation efficiency urea at non-resonant wavelength 1.9 µm. Compared conventional rod-shaped...

We show that the organic polyene crystal 2-{3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene}malononitrile (OH1) is a new material with excellent nonlinear optical and electro-optical properties. The principal refractive indices absorption constants have been determined over broad wavelength range from 0.6to2.2 μm. OH1 shows large birefringence of Δn>0.55 low α<1 cm−1 in between 800 1400 nm. Furthermore, tensor elements d333=120 ± 10 pm/V, d223=13 2 d322=8.5 pm/V by Maker-fringe...

We report on the growth of large-size phenolic configurationally locked polyene OH1 (2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile) organic bulk crystals. has been recently identified as very promising for electro-optic and THz-wave applications, with several advantages compared to benchmark ionic salts such DAST (4′-dimethylamino-N-methyl-4-stilbazolium tosylate) DSTMS (4-N,N-dimethylamino-4′-N′-methyl-stilbazolium 2,4,6-trimethylbenzene sulfonate). investigate...

Abstract In Terahertz (THz) science, one of the long-standing challenges has been formation spectrally dense, single-cycle pulses with tunable duration and spectrum across frequency range 0.1–15 THz ( gap ). This band, lying between electronically optically accessible spectra hosts important molecular fingerprints collective modes which cannot be fully controlled by present strong-field sources. We a method that provides powerful in stable absolute phase whose can continuously selected 68 fs...

New organic nonlinear optical configurationally locked polyene (CLP) crystals based on 3,5-dimethyl-2-cyclohexen-1-one have been designed and their supramolecular organization investigated. Acentric single 2-(5-methyl-3-(4-(pyrrolidin-1-yl)styryl)cyclohex-2-enylidene)malononitrile (MH2) of large sizes with a maximal side length up to 1 cm grown from acetonitrile solution. The acentric MH2 present the monoclinic space-group symmetry Cc exhibit macroscopic nonlinearity similar powder...

Pyrrolic viscosity sensors exhibit one order of magnitude higher fluorescence contrast compared to that the conventional phenolic analogues due viscosity-sensitive rotation rotational pyrrole group.

For terahertz (THz) wave generators based on organic electrooptic crystals, their intrinsic phonon modes are playing an essential role in THz generation characteristics. Here, this study proposes effective design strategy for mode engineering of salt crystals efficient optical‐to‐THz frequency conversion. To reduce phonon‐mode intensity, strongly electronegative trifluoromethyl group acting as strong hydrogen‐bond acceptor is incorporated into molecular anions. New...

This study investigates the performance of single-crystalline nanomaterials wide-band gap naphthalene diimide (NDI) derivatives with methylene-bridged aromatic side chains. Such materials are found to be easily used as high-performance, visible-blind near-UV light detectors. NDI nanoribbons assembled using a simple solution-based process (without solvent-inclusion problems), which is then applied organic phototransistors (OPTs). OPTs exhibit excellent n-channel transistor characteristics,...

Abstract 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 crystals, which are used for most benchmark THz sources, have additional superior advantages generation, e.g., higher transparency in the visible wavelength range accompanying different phase‐matching possibilities. The new consist of a highly nonlinear optical...

Ultrafast terahertz (THz) spectroscopy is a potent tool for studying the fundamental properties of matter. Limitations current THz sources, however, preclude technique being applied in certain advanced configurations or measurement of, e.g., strongly absorbing samples. In response to this problem, here we demonstrate generation 1.38 mW broadband radiation at 10 MHz repetition rate by combining highly efficient nonlinear organic crystal HMQ-TMS with ultrafast pump pulses generated using...