Numerical investigation of imaging-free terahertz generation setup using segmented tilted-pulse-front excitation

Tóth, György; Pálfalvi, László; Fülöp, J. A.; Krizsán, Gergő; Matlis, Nicholas H.; Almási, Gábor; Hebling, J.

doi:10.1364/oe.27.007762

Cited by 33 publications

(20 citation statements)

References 28 publications

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“…[70] A proof-of-principle experimental demonstration has also been carried out. [71,72] We note that a reflective echelon has Adv. Inside the LN slab, a segmented tilted pulse front is formed with an average tilt angle as required by phase matching.…”

Section: Novel Scalable Conceptsmentioning

confidence: 99%

Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

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287

147

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reason for this interest relies on the fact that THz radiation can couple resonantly to numerous fundamental motions of ions, electrons, and electron spins in all phases of matter. For example, in solids, the THz range overlaps with the frequency of lattice vibrations (phonons), the collision rates of conduction electrons, the binding energy of bound electron-hole pairs (excitons), and the precession frequency of spin waves (magnons). Consequently, THz radiation, both continuous-wave and pulsed, has been used for characterization of and gaining insight into elementary processes in complex materials. The majority of these studies used relatively weak THz fields and, thus, probed the linear response of the material, without inducing notable material modifications.Only recently, however, completely new avenues in THz science were opened up by triggering nonlinear THz responses of materials. [3][4][5][6][7][8][9][10][11][12][13] Instead of using weak fields to primarily observe selected THz modes such as phonons or magnons, strong fields allow one to actively drive them to unprecedentedly large amplitudes, potentially thereby resulting in novel states of matter. [6,8,11] For example, simulations suggest that exciting matter with intense THz transients may lead to massive modifications of electrically [14] or magnetically [15] ordered domains and enable the acceleration of free ions to ≈1 MeV, [16] and postacceleration to 50-100 MeV energies. [17] Remarkable experimental results such as switching of magnetic order, [18,19] parametric amplification of optical phonons, [20] novel insights into spin-lattice coupling, [21,22] and acceleration of free electrons in a THz linear accelerator [23] were achieved only recently. This progress has been made possible by the development of laser-driven table-top THz sources routinely providing pulses with unprecedented energies and peak electric and magnetic field strengths throughout the entire THz spectral range. Different laser-based THz pulse generation techniques can be used to access different parts of the spectral range extending from 0.1 to 10 THz. Some of the recently developed technologies enable the generation of radiation with even larger bandwidth or tuning range up to 100 THz and beyond, which lead to an extension of what is called the THz spectral range. An overview of the approximate spectral coverage and the achieved highest pulse energies and peak electric-field strengths of various laserdriven technologies is given in Figure 1. ScopeIn this work, the basic principles of femtosecond-laser-driven intense pulsed THz sources and their recent development are reviewed. These sources are capable of delivering peak electric field strengths on the MV cm −1 scale. Corresponding typical THz pulse energies are on the µJ-to-mJ level, depending on A review on the recent development of intense laser-driven terahertz (THz) sources is provided here. The technologies discussed include various types of sources based on optical rectification (OR), spintronic emitters, and laserfilame...

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Section: Novel Scalable Conceptsmentioning

confidence: 99%

Laser‐Driven Strong‐Field Terahertz Sources

Fülöp

Tzortzakis

Kampfrath

2019

Advanced Optical Materials

Self Cite

287

147

View full text Add to dashboard Cite

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“…The second term of Eq. (28) implies that close to the source location (i.e. z ≈ 0), the field is virtually z propagating because the second term vanishes.…”

Section: Temporal Profilesmentioning

confidence: 99%

“…As the terahertz wave propagates, its radius of curvature continues to increase as evident from the final term in Eq. (28).…”

Section: Temporal Profilesmentioning

confidence: 99%

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Analysis of terahertz generation by beamlet superposition

et al. 2019

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A theory of terahertz generation using a superposition of beamlets is developed. It is shown how such an arrangement produces a distortion-free tilted pulse front. We analytically show how a superposition of beamlets produces terahertz radiation with greater efficiency and spatial homogeneity compared to tilted pulse fronts generated by diffraction gratings. The advantages are particularly notable for large pump bandwidths and beam sizes, suggesting better performance in the presence of cascading effects and for high energy pumping. Closed-form expressions for terahertz spectra and transients in three spatial dimensions are derived. Conditions for obtaining performance better than conventional tilted pulse fronts and bounds for optimal pump parameters are furnished. arXiv:1810.09118v3 [physics.optics]

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“…Conceptually similar idea is used when THz frequencies are emitted via optically excited photoconductive switchers, nowadays often enhanced by nanostructures [2,3,8,9]. In parallel, high efficient methods of THz pulse synthesis via optical rectification in different materials have been developed so far [10][11][12]. In [13] a novel way of unipolar half-cycle pulse production via reflection of single-cycle pulse from linear broad thin metallic or dielectric medium was proposed.…”

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Coherently controlled generation of single-cycle terahertz pulses from a thin layer of nonlinear medium with low-frequency resonances

et al. 2020

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We propose a novel scheme to generate single-cycle terahertz (THz) pulses via reflection of an optical femtosecond pulse train from a thin layer of nonlinear resonant medium. Our method is based on a coherent control of low-frequency oscillations and free induction decay in the medium. The specific single-cycle shape of generated THz pulses requires a plane wavefront and detection in the near field. Our theoretical results pave the way to a new, simple and high-efficiency way to generate single-cycle waveshape-tunable terahertz pulses.

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Numerical investigation of imaging-free terahertz generation setup using segmented tilted-pulse-front excitation

Cited by 33 publications

References 28 publications

Laser‐Driven Strong‐Field Terahertz Sources

Laser‐Driven Strong‐Field Terahertz Sources

Analysis of terahertz generation by beamlet superposition

Coherently controlled generation of single-cycle terahertz pulses from a thin layer of nonlinear medium with low-frequency resonances

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