研究目的
Investigating the surface nonlinear optics on a centrosymmetric Dirac nodal-line semimetal ZrSiS crystal to explore the exotic and applicable properties of gapless surface states (SSs).
研究成果
The study demonstrated that the surface electron states of ZrSiS hold the capacity to convert photon frequency with high efficiency, leading to unprecedented conversion efficiencies for SHG and THG. This work not only discovers the giant nonlinear response of the topological SSs but also creates a novel roadmap toward exploration and application of surface nonlinear optics and photonics.
研究不足
The study is limited by the technical constraints of the NLO measurements and the potential influence of bulk states on the surface-derived properties. The application of the findings in practical optoelectronic devices requires further optimization and integration studies.
1：Experimental Design and Method Selection:
The study involved the use of nonlinear optical (NLO) techniques to investigate the surface nonlinear optics of ZrSiS, focusing on second harmonic generation (SHG) and third harmonic generation (THG). The methodology included polarization rotation scans and reflection geometry measurements.
2：Sample Selection and Data Sources:
Single-crystalline ZrSiS was grown using a chemical vapor transport method. The cleaved (001) surface of the as-grown ZrSiS crystal was used for NLO measurements.
3：List of Experimental Equipment and Materials:
The setup included an optical parametric amplification for pulsed fundamental lasers, a half wave plate, a Glan-laser prism, an objective lens, narrow-band filters, and a spectrometer for analyzing the wavelength and intensity of the signals.
4：Experimental Procedures and Operational Workflow:
The polarized fundamental light was incident on the cleaved (001) surface of ZrSiS. The reflected SHG and THG signals were collected by the objective lens and analyzed by the spectrometer.
5：Data Analysis Methods:
The data analysis involved fitting the SHG and THG intensities as functions of the incident rotation angle and comparing the nonlinear susceptibilities of ZrSiS with reference materials.
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