All-optical ultrafast polarization switching of terahertz radiation by impulsive molecular alignment

Li, Min; Pan, Haifeng; Tong, Yuqi; Chen, Cheng; Shi, Yi; Wu, Jian; Zeng, Heping

doi:10.1364/ol.36.003633

Cited by 38 publications

(21 citation statements)

References 14 publications

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“…A frequency-doubling β -BBO (200 μm, type I) was inserted between lens and filament, leading to second harmonic generation. THz emission from dual-color filament [24,25] was used as the probe pulse to measure the refractive index of substrates. The THz probe pulses were focused onto the back surface of sample by a pair of parabolic mirrors.…”

Section: Resultsmentioning

confidence: 99%

Terahertz and Photoelectron Emission from Nanoporous Gold Films on Semiconductors

Nan

Zhang

et al. 2019

Nanomaterials

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Efficient terahertz and photoelectron emission were observed from nano-porous gold (NPG) films deposited on an intrinsic gallium arsenide (GaAs) semiconductor substrate stimulated by femtosecond laser with pulse width of 60 fs. Time-domain THz emission and reflection spectroscopy confirmed that the free charges accelerated by irradiated femtosecond laser pulses transferred from the NPG films into the GaAs substrates. Accordingly, charges accumulation was reduced in the NPG films, resulting in a stronger emission of THz pulse than that from NPG films deposited on SiO2 substrate. Charges injected into the GaAs substrate enforced an observable decrease of the THz refractive index proportional to the intensity of incident light. In comparison, for NPG deposited on glass substrates, laser induced free charges were accumulated in the NPG films, and femtosecond laser pulses irradiating on the NPG films made no changes of the THz refractive index of the glass substrates.

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Section: Resultsmentioning

confidence: 99%

Terahertz and Photoelectron Emission from Nanoporous Gold Films on Semiconductors

Nan

Zhang

et al. 2019

Nanomaterials

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“…The polarization of light is one of the most remarkable phenomena in nature and has led to numerous discoveries and applications [1,2] . Owing to their essential function in modulating the polarization of light, birefringent materials have attracted extensively academic and commercial interest in many branches of science and engineering, such as the laser industry, optical communication, polarimetry, and scientific instrumentation, etc [3–10] . Over the past few decades, the most widely used birefringent materials are CaCO 3 , [11] α ‐BaB 2 O 4 , [12] YVO 4 , [13] TiO 2 , [14] and LiNbO 3 [15] .…”

Section: Figurementioning

confidence: 99%

KSnI₃ ⋅ H₂O: A New Compound with One‐Dimensional SnI₃ Chains of Pyramidal SnI₅ Polyhedra

Feng

2020

ChemistrySelect

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A new compound KSnI 3 ⋅H 2 O was synthesized through the solidstate reaction method in a sealed quartz tube. The Sn (II) cations are five-coordinated with I À ions forming the special pyramidal SnI 5 polyhedra which further condense to onedimensional SnI 3 chains connected by KÀ I bonds and OÀ H⋅⋅⋅I hydrogen bonds. Meanwhile, the first principles calculations were also carried out to aid the understanding of optical properties and electronic structure. The electronic localization functions (ELF) prove the stereochemical activity of the Sn (II) lone pair and the electronic structure analysis has been carried out to understand the optical properties deeply. The calculated birefringence of the title compound is 0.121 at 1064 nm which is mainly originated from the contribution of the SnI 5 polyhedra. The polarization of light is one of the most remarkable phenomena in nature and has led to numerous discoveries and applications. [1,2] Owing to their essential function in modulating the polarization of light, birefringent materials have attracted extensively academic and commercial interest in many branches of science and engineering, such as the laser industry, optical communication, polarimetry, and scientific instrumentation, etc. [3-10] Over the past few decades, the most widely used birefringent materials are CaCO 3 , [11] α-BaB 2 O 4 , [12] YVO 4 , [13] TiO 2 , [14] and LiNbO 3. [15] All of these materials exhibit excellent birefringence and have been widely used to produce optical devices such as polarizers, optical isolators, phase compensator, circulators, and polarization beam displacers, which have been broadly used in the spectral regions from the ultraviolet (UV) to infrared (IR) range. [16-18] Even so, scientists have not stopped searching for better birefringent materials and struggled to hunt for excellent birefringent functional units to gain large birefringence. Generally speaking, the anion groups and the metal cation polyhedra in the structure greatly affect the birefringent property of a crystal. As for the anion groups, triangle or planar groups with π-conjugation, including BO 3 , CO 3 , NO 3 , and C 3 N 3 O 3 units, are beneficial to obtain large birefringence. [19-26] Meantime, the effect of metal cation polyhedra on the birefringence cannot be overlooked. It has been recognized that the cations susceptible to second-order Jahn-Teller (SOJT) distortions, for example, octahedrally coordinated d 0 transition metal ions (Nb 5 + , W 6 + , V 5 + , Mo 6 + , etc.) [27-29] and stereo active lone pair-contained cations (Pb 2 + , Sn 2 + , Se 4 + , Te 4 + , I 5 +) have important effects on the birefringence. [30-33] With the discovery of the Sn 2 +-containing new birefringence material, Lin et al. proposed that the introduction of lone-pair electrons in microscopic structures is beneficial to the enhancement of optical anisotropy in crystals. [34] Very recently, Pan et al. discovered the first tin borate chloride, Sn 2 B 5 O 9 Cl with a brilliant birefringence of 0.168 at 546 nm. [35] Its birefringence is...

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“…Spectral shifts could also be achieved by producing laser filaments in atom gases and by monitoring compression and self-steepening events by varying the pump wavelength, the pressure, and the nature of the gas undergoing photoionization [12][13][14]. An alternative mechanism for ultrashort pulse spectral conversion called molecular phase modulation (MPM) has also been demonstrated [15,16], It is based on impulsive molecular alignment in Raman-active gases, where an ultrashort pulse first propagates through the molecular gas and excites impul sively molecular alignment; then a time-delayed probe pulse experiences a rapid phase modulation due to refractive index variation caused by the molecular alignment revivals [17][18][19][20][21], With such methods [22], the central wavelength of an initial 800-nm, 5-fs Gaussian pulse is theoretically shown to be tuned from 324.6 to 4237.3 nm by using impulsively excited molecular alignment created by another 800-nm, 100-fs laser pulse of intensity 3.5 x 1013 W /cm 2, which is very promising as a tunable source. In order to gain more insight into the propagation dynamics involved for future implementation, a more accurate model is needed to include effects such as waveguide attenuation and dispersion, ionization, plasma defocusing, and so on.…”

Section: Introductionmentioning

confidence: 99%

Tuning the central wavelength by hundreds of nanometers using ultrafast molecular phase modulation

et al. 2015

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We theoretically study the central wavelength tuning of a laser pulse propagating in a hollow-core fiber filled with prealigned nitrogen gas. The simulation results show that the double pump pulses, suitable pump pulse energy, gas pressure, and temperature can extend the wavelength shift range, and the spectral blueshift or redshift can be controlled by tuning the time delay between the pump and probe pulses. It is also shown that several hundred nanometers wavelength tuning is obtained by the double pump pulses with appropriate parameters.

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All-optical ultrafast polarization switching of terahertz radiation by impulsive molecular alignment

Cited by 38 publications

References 14 publications

Terahertz and Photoelectron Emission from Nanoporous Gold Films on Semiconductors

Terahertz and Photoelectron Emission from Nanoporous Gold Films on Semiconductors

KSnI₃ ⋅ H₂O: A New Compound with One‐Dimensional SnI₃ Chains of Pyramidal SnI₅ Polyhedra

Tuning the central wavelength by hundreds of nanometers using ultrafast molecular phase modulation

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All-optical ultrafast polarization switching of terahertz radiation by impulsive molecular alignment

Cited by 38 publications

References 14 publications

Terahertz and Photoelectron Emission from Nanoporous Gold Films on Semiconductors

Terahertz and Photoelectron Emission from Nanoporous Gold Films on Semiconductors

KSnI3 ⋅ H2O: A New Compound with One‐Dimensional SnI3 Chains of Pyramidal SnI5 Polyhedra

Tuning the central wavelength by hundreds of nanometers using ultrafast molecular phase modulation

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KSnI₃ ⋅ H₂O: A New Compound with One‐Dimensional SnI₃ Chains of Pyramidal SnI₅ Polyhedra