AI Article Synopsis
- The study investigates the plasmon-enhanced nonlinear nanofocusing using a gold nanoprism array substrate (ANAS) with an ultrafast azimuthal vector beam (AVB).
- The results indicate that the ANAS excited by the femtosecond AVB produces a significantly higher second harmonic (SH) intensity—around 3.8 times greater—compared to linear polarization beam (LPB) excitation.
- Additionally, when GaSe nanosheets are placed on the ANAS, the SH intensity increases by approximately 4.7 times under AVB excitation, highlighting the superior nonlinear plasmonic nanofocusing capability of the ANAS with AVB compared to LPB.
Article Abstract
We present the plasmon-enhanced nonlinear nanofocusing of a gold (Au) nanoprism array substrate (ANAS) driven via an ultrafast azimuthal vector beam (AVB). Theoretical calculations show that the electric-field intensity of the ANAS vertically excited via the femtosecond AVB is higher than that of LPB excitation. In this experiment, the second-order surface nonlinear optical response of the ANAS is adopted to examine the nonlinear plasmonic nanofocusing of the ANAS, and it was observed that the second harmonic (SH) intensity of the ANAS excited via the femtosecond AVB is ∼3.8 times higher than that of LPB excitation, revealing that the ANAS under AVB excitation has a better nonlinear plasmonic nanofocusing characteristic than that under LPB excitation. Furthermore, the GaSe nanosheets are transferred on the ANAS to examine the nonlinear plasmonic nanofocusing of the ANAS. The SH intensity of the GaSe nanosheets deposited on the ANAS via the femtosecond AVB excitation has been enhanced ∼4.7 times than that of LPB excitation, indicating that the ANAS via AVB excitation has better nonlinear plasmonic nanofocusing than that of LPB excitation. This method may be used as a nonlinear nanofocusing light source to increase the light-matter nonlinear interaction.
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| http://dx.doi.org/10.1039/c9nr09710d | DOI Listing |
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Article Synopsis
- The study investigates the plasmon-enhanced nonlinear nanofocusing using a gold nanoprism array substrate (ANAS) with an ultrafast azimuthal vector beam (AVB).
- The results indicate that the ANAS excited by the femtosecond AVB produces a significantly higher second harmonic (SH) intensity—around 3.8 times greater—compared to linear polarization beam (LPB) excitation.
- Additionally, when GaSe nanosheets are placed on the ANAS, the SH intensity increases by approximately 4.7 times under AVB excitation, highlighting the superior nonlinear plasmonic nanofocusing capability of the ANAS with AVB compared to LPB.
Enhanced second harmonic generation from a plasmonic Fano structure subjected to an azimuthally polarized light beam.
J Phys Condens Matter
February 2018
MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an 710129, People's Republic of China.
We show that an azimuthally polarized beam (APB) excitation of a plasmonic Fano structure made by coupling a split-ring resonator (SRR) to a nanoarc can enhance second harmonic generation (SHG). Strikingly, an almost 30 times enhancement in SHG peak intensity can be achieved when the excitation is switched from a linearly polarized beam (LPB) to an APB. We attribute this significant enhancement of SHG to the corresponding increase in the local field intensity at the fundamental frequency of SHG, resulting from the improved conversion efficiency between the APB excitation and the plasmonic modes of the Fano structure.
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