2023
DOI: 10.1021/acsphotonics.3c00787
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Subwavelength, Phase-Sensitive Microscopy of Third-Order Nonlinearity in Terahertz Frequencies

Tong Lin,
Rui Xu,
Xiaotong Chen
et al.

Abstract: The third-order nonlinear susceptibility χ (3) occurs universally in materials and can provide label-free fingerprints of materials' electronic, vibrational, and structural information. One quantitative spectroscopic method to access low-energy resonances of χ (3) is the terahertz electric-field-induced second harmonic generation (TEFISH), which is particularly suitable for centrosymmetric materials without second-order processes. However, using TEFISH to measure the χ (3) spectra requires light sources with h… Show more

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Cited by 5 publications
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“…Several groups in the world have examined different nonlinear materials for THz emission by optical rectification. These materials include organic salts such as dimethyl amino 4-N-methylstilbazolium tosylate (DAST) [14][15][16][17][18], dielectric inorganic electro-optical materials like LiTaO 3 , and semiconductors such as GaAs and GaP [19]. Among them, DAST is the most efficient THz rectification material [20,21], due to its large electro-optics coefficient and its low dielectric constant (ϵ = 5.2), giving rise to a high modulator figure of merit [21].…”
Section: Introductionmentioning
confidence: 99%
“…Several groups in the world have examined different nonlinear materials for THz emission by optical rectification. These materials include organic salts such as dimethyl amino 4-N-methylstilbazolium tosylate (DAST) [14][15][16][17][18], dielectric inorganic electro-optical materials like LiTaO 3 , and semiconductors such as GaAs and GaP [19]. Among them, DAST is the most efficient THz rectification material [20,21], due to its large electro-optics coefficient and its low dielectric constant (ϵ = 5.2), giving rise to a high modulator figure of merit [21].…”
Section: Introductionmentioning
confidence: 99%