Toroidal dipole-modulated dipole-dipole double-resonance in colloidal gold rod-cup nanocrystals for improved SERS and second-harmonic generation

Kang，Hao Sen1; Zhao，Wen Qin1; Zhou，Tao2; Ma，Liang1; Yang，Da Jie3; Chen，Xiang Bai1; Ding，Si Jing2; Wang，Qu Quan4

2022-07-01

10.1007/s12274-022-4562-5

Nano Research   Impact Factor & Quartile

1998-0124

1998-0000

Colloidal metal nanocrystals (NCs) show great potential in plasmon-enhanced spectroscopy owing to their attractive and structure-depended plasmonic properties. Herein, unique Au rod-cup NCs, where Au nanocups are embedded on the one or two ends of Au nanorods (NRs), are successfully prepared for the first time via a controllable wet-chemistry strategy. The Au rod-cup NCs possess multiple plasmon modes including transverse and longitudinal electric dipole (TED and LED), magnetic dipole (MD), and toroidal dipole (TD) modulated LED resonances, producing large extinction cross-section and huge near-field enhancements for plasmon-enhanced spectroscopy. Particularly, Au rod-cup NCs with two embedded cups show excellent surface-enhanced Raman spectroscopy (SERS) performance than Au NRs (75.6-fold enhancement excited at 633 nm) on detecting crystal violet owing to the strong electromagnetic hotspots synergistically induced by MD, LED, and TED-based plasmon coupling between Au cup and rod. Moreover, the strong TD-modulated dipole-dipole double-resonance and MD modes in Au rod-cup NCs bring a 37.3-fold enhancement of second-harmonic generation intensity compared with bare Au NRs, because they can efficiently harvest photoenergy at fundamental frequency and generate large near-field enhancements at second-harmonic wavelength. These findings provide a strategy for designing optical nanoantennas for plasmon-enhanced applications based on multiple plasmon modes.

plasmon toroidal dipole near-field enhancement surface-enhanced Raman spectroscopy (SERS) second-harmonic generation

SCI ; EI

English

Others

National Natural Science Foundation of China["11904270","11904332"] ; Hubei Key Laboratory of Optical Information and Pattern Recognition["202004","202010"]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000823229400010

TSINGHUA UNIV PRESS

20222812336127

Gold ; Harmonic analysis ; Harmonic generation ; Light emitting diodes ; Light transmission ; Nanorods ; Nonlinear optics ; Plasmonics ; Raman spectroscopy ; Resonance

Precious Metals:547.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Nonlinear Optics:741.1.1 ; Nanotechnology:761 ; Numerical Methods:921.6 ; Mechanics:931.1 ; Plasma Physics:932.3 ; Solid State Physics:933 ; Crystalline Solids:933.1

2-s2.0-85133615065

Web of Science

1.Hubei Key Laboratory of Optical Information and Pattern Recognition,Wuhan Institute of Technology,Wuhan,430205,China
2.School of Mathematics and Physics,China University of Geosciences (Wuhan),Wuhan,430074,China
3.Mathematics and Physics Department,North China Electric Power University,Beijing,102206,China
4.School of Science,Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Kang，Hao Sen,Zhao，Wen Qin,Zhou，Tao,et al. Toroidal dipole-modulated dipole-dipole double-resonance in colloidal gold rod-cup nanocrystals for improved SERS and second-harmonic generation[J]. Nano Research,2022.

Kang，Hao Sen.,Zhao，Wen Qin.,Zhou，Tao.,Ma，Liang.,Yang，Da Jie.,...&Wang，Qu Quan.(2022).Toroidal dipole-modulated dipole-dipole double-resonance in colloidal gold rod-cup nanocrystals for improved SERS and second-harmonic generation.Nano Research.

Kang，Hao Sen,et al."Toroidal dipole-modulated dipole-dipole double-resonance in colloidal gold rod-cup nanocrystals for improved SERS and second-harmonic generation".Nano Research (2022).