Terahertz generation and optical properties of N-benzyl-2-methyl-4-nitroaniline single crystals in 0.1–2.0 THz range for photonic applications

Karthick, S.; Ganesh, D Sharma; Thirupugalmani, K.; Chaudhary, A.K.; Brahadeeswaran, S.

doi:10.1016/j.matlet.2019.03.039

Cited by 15 publications

(4 citation statements)

References 15 publications

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“…In this letter, we pump BNA with 800-nm and 1250-1500-nm pump pulses and report the THz output of crystal thicknesses ranging from 123 to 700 μm. Previous reports have shown differences in BNA crystals produced with different methods [8], and we show that in our crystals, the previously reported dip in THz generation at 2 THz is greatly reduced. This results in a broad, smooth THz spectrum from 0 to 6 THz.…”

supporting

confidence: 49%

Comprehensive characterization of terahertz generation with the organic crystal BNA

et al. 2021

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We characterize the THz generation of N-benzyl-2-methyl-4-nitroaniline (BNA), with crystals ranging in thickness from 123-700 μm. We compare excitation using 1250-1500-nm and 800-nm wavelengths. Pumping BNA with both 800-nm wavelengths and longer near-infrared wavelengths results in a broad spectrum, producing out to 6 THz using a 100-fs pump, provided the BNA sample is thin enough. ~200 μm or thinner crystals are required to produce a broad spectrum with an 800-nm pump, whereas ~300 μm crystals are optimal for broadband THz generation using the longer wavelengths. We report the favorable THz generation and optical characteristics of our BNA crystals that make them attractive for broadband, highfield THz generation, and we also find significant differences to BNA results reported in other works.

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confidence: 49%

Comprehensive characterization of terahertz generation with the organic crystal BNA

et al. 2021

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“…In addition, the presence of water molecules in the atmosphere contributes to strong absorption in certain bands of generated frequency [4][5][6]. A large number of semiconductors, organic and inorganic nonlinear crystals are evaluated for the THz generation using different types of optical techniques such as ultrafast switching in Photoconductive antennas, Difference Frequency Mixing (DFM) and Optical Rectification (OR) in ZnTe, GaAs, ZnGeP 2 , DAST, BNA, OH1 ,CdTe crystals and thin films [6][7][8][9][10][11][12][13][14].6-14. Vicario, C et al groups investigated the high-field THz generation in organic crystals DSTMS, DAST, and OH1 by optical rectification process using femtosecond Cr: fosterite laser pulse at 10 Hz repetition and they have achieved maximum conversion efficiency as high as 3% which corresponds to energy per pulse up to 270 μJ [15].…”

Section: Introductionmentioning

confidence: 99%

Comparative studies of terahertz-based optical properties in transmission/reflection modes of GaSe: S and measurement of its scattering losses due to surface roughness for efficient terahertz generation

Ghorui¹,

Arjun²,

Kumar³

et al. 2023

Phys. Scr.

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The paper reports the efficient terahertz generation using nonlinear optical rectification process and comparative studies of optical, dielectric, and surface scattering properties of 1.0 mm thin GaSe: S crystal in transmission/reflection modes. We employed 800 nm wavelength of 140 fs and 50 fs pulse durations obtained from Ti: Sapphire oscillator and amplifier systems at 80 MHz and 1 kHz repetition rates, respectively, and evaluated the THz generation potential and optical properties such as refractive index, absorption coefficients, relative permittivity in transmission mode. In the next step, the crystal was subjected to a commercial THz system of 0.3 picosecond pulses at 100 MHz repetition rate in reflection geometry and once again recorded the similar parameters and compared with the transmission mode data. In addition, these data were used to measure the scattering losses from the surface of the crystal in terms of surface roughness, optical impedance, and Fresnel’s reflection coefficients. The maximum generated THz power was of the order of 4.5 μW with conversion efficiency (η) ~2.2 x 10-3%. The measured THz efficiency was found equivalent to 20 mm thick GaSe crystal used in the difference frequency mixing technique. Finally, we have measured the Rayleigh roughness factor (g) of the crystal surface at different THz frequencies. When g < 1 (for small roughness) the Fresnel reflection loss factor becomes 0.75 at 1.4 THz frequency range which helps to enhance the generated signal.

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“…Recently, BNA single crystal has been found significant for terahertz (THz) spectral applications because of its wide transparency in the electromagnetic spectrum which lies between the microwave and infrared regions. [ 1–9 ] At first, Hasimotto et al. synthesized the BNA material from 2‐methyl‐4‐nitroaniline (MNA) and reported that the grown BNA single crystal had strongest SHG intensity among N ‐substituted derivatives of MNA.…”

Section: Introductionmentioning

confidence: 99%

“…[ 10 ] Subsequently, the BNA material was synthesized under a newer chemical environment and reported in our previous communication. [ 11 ] Though various methods of solution growth such as solvent evaporation and slow cooling methods are being adapted by many researchers to grow bulk size of BNA single crystals with good optical quality by considering its admirable properties, [ 9–15 ] yet problems such as the presence of solution inclusion, internal growth defects, and lattice mismatches within the grown crystals are inevitable and hence the single crystal growth of BNA with desired properties for the development of an effective THz wave generation is still a challenging one. [ 15 ] Hence finding out alternative methods of crystal growth is the need of the hour which will yield defect free single crystals but it depends very much on the physical and chemical properties of the material concerned.…”

Section: Introductionmentioning

confidence: 99%

Single Crystal Growth of N‐Benzyl‐2‐methyl‐4‐nitroaniline by Seeded Czochralski Pulling Technique for NLO and THz Applications

Kalaivanan

Aruchamy

Srinivasan

2020

Crystal Research and Technology

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Single crystal of N‐benzyl‐2‐methyl‐4‐nitroaniline (BNA), a potential organic nonlinear optical (NLO) material for terahertz (THz) pulse generation, is grown successfully from diffusion controlled melt environment by Czochralski pulling (Cz) technique and is reported for the first time. A solution grown crystal having habitual morphology is used as a seed with pre‐determined crystal rotations at constant melt temperature of 102 °C. Unit cell structure of melt grown BNA is refined using single crystal X‐ray diffraction (SCXRD) analysis and is compared with that of the solution grown one. Crystal packing with the dominance of intermolecular hydrogen bonding such as C─H…O, N─H─O, and C─H…π is examined using 2D finger print (FP) plot and 3D Hirshfeld surface (HS) analysis. The presence of minimal percentage of voids reflects the good stacking of molecular arrangement in the melt grown crystals when compared to the solution grown ones. Crystalline purity is confirmed by powder X‐ray diffraction (PXRD) analysis. Modes of vibrations of different functional groups present and wide optical transparency of the grown BNA are realized using Fourier‐transform infrared (FTIR) and ultraviolet‐visible‐near infrared (UV–vis–NIR) spectroscopic analyses, respectively. Thermal stability and melting point are confirmed through differential scanning calorimetry (DSC).

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Terahertz generation and optical properties of N-benzyl-2-methyl-4-nitroaniline single crystals in 0.1–2.0 THz range for photonic applications

Cited by 15 publications

References 15 publications

Comprehensive characterization of terahertz generation with the organic crystal BNA

Comprehensive characterization of terahertz generation with the organic crystal BNA

Comparative studies of terahertz-based optical properties in transmission/reflection modes of GaSe: S and measurement of its scattering losses due to surface roughness for efficient terahertz generation

Single Crystal Growth of N‐Benzyl‐2‐methyl‐4‐nitroaniline by Seeded Czochralski Pulling Technique for NLO and THz Applications

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Terahertz generation and optical properties of N-benzyl-2-methyl-4-nitroaniline single crystals in 0.1–2.0 THz range for photonic applications

Cited by 15 publications

References 15 publications

Comprehensive characterization of terahertz generation with the organic crystal BNA

Comprehensive characterization of terahertz generation with the organic crystal BNA

Comparative studies of terahertz-based optical properties in transmission/reflection modes of GaSe: S and measurement of its scattering losses due to surface roughness for efficient terahertz generation

Single Crystal Growth of N‐Benzyl‐2‐methyl‐4‐nitroaniline by Seeded Czochralski Pulling Technique for NLO and THz Applications

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Terahertz generation and optical properties of N-benzyl-2-methyl-4-nitroaniline single crystals in 0.1–2.0 THz range for photonic applications