研究目的
To demonstrate excitation-collection-separated enhanced spectroscopy using a matched nanoantenna pair for remote surface-enhanced Raman scattering with a high signal-to-noise ratio.
研究成果
The study successfully demonstrated a design philosophy of an excitation-collection-separated matched nanoantenna pair for remote spectroscopy. The configuration ensures a high signal-to-noise ratio and has potential applications in biochemical detection, nonlinear optical conversion, and wireless optical communications.
研究不足
The study is limited by the fabrication stability and excitation efficiency of the nanoantenna pair. The efficiency of the device is dependent on the precise matching of the cavity plasmon resonances of the NWOM and NCOM.
1：Experimental Design and Method Selection:
The study employs a matched nanoantenna pair consisting of a receiving antenna (silver nanowire on mirror) and a transmitting antenna (silver nanocube over mirror) bridged by propagating surface plasmon polaritons (SPPs) on a metal film. The methodology involves numerical simulations and experimental validation of remote surface-enhanced Raman scattering (SERS).
2：Sample Selection and Data Sources:
Chemically synthesized crystalline silver nanowires and nanocubes were deposited on an ultrasmooth gold film. The spacer layer separating the nanoparticles and the gold mirror was precisely controlled.
3：List of Experimental Equipment and Materials:
A supercontinuum white light source with a tunable wavelength filter, a homemade microscope with a 100× objective, a confocal Raman system, and a TE air-cooled CCD were used. Materials included silver nanowires, silver nanocubes, and an ultrasmooth gold film.
4：Experimental Procedures and Operational Workflow:
The Ag NW was excited with a wavelength-tunable picosecond laser, and the generated signal was collected by the same objective and sent to the CCD camera. Remote SERS was performed by focusing a continuous wave laser on the Ag NW and collecting the signal from the Ag NCs.
5：Data Analysis Methods:
The out-scattered intensity from the transmitting antenna was analyzed to understand the interplay of the LSPR-SPPs and SPPs-LSPR conversion efficiencies. Raman signals were collected and analyzed for spectral properties.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
silver nanowire
Acts as a receiving antenna for high light-to-plasmon conversion efficiency.
-
silver nanocube
nanoComposix
Acts as a transmitting antenna for converting near-field signals into detectable amplified far-field signals.
-
gold film
Serves as a mirror for the nanoantenna pair and supports propagating surface plasmon polaritons (SPPs).
-
Al2O3 spacer
Separates the nanoparticles and the gold mirror, with thickness precisely controlled.
-
supercontinuum white light source
Used for exciting the Ag NW with a tunable wavelength filter.
-
confocal Raman system
Invia
Renishaw
Used for collecting and analyzing Raman signals.
-
TE air-cooled CCD
576 × 400
Used for collecting the Raman signal in the Raman microscopic system.
-
登录查看剩余5件设备及参数对照表
查看全部
