研究目的
To demonstrate how a fluorescent microsphere coupled to a silver nanowire can act as a remotely excited optical antenna, combining dielectric optical resonances with plasmon-polariton waves for applications in chip-scale nano-optical communication and sensing.
研究成果
The study successfully demonstrated a self-assembled optical antenna that combines dielectric optical resonances with propagating plasmons, showing directional emission that can be tuned by the thickness of the silver nanowire and the size of the microsphere. This hybrid structure has potential applications in nonlinear hybrid nanophotonics, random lasing, and nano-optical sensing.
研究不足
The study is limited by the sensitivity of whispering gallery modes to the environment, which can shift the peak position and broaden the full width at half maxima of the peaks. Additionally, the computational limits in simulating the near to far field transformation without a substrate.
1：Experimental Design and Method Selection:
The study utilized a self-assembly methodology to couple a fluorescent silica microsphere to a single silver nanowire. Propagating surface plasmon polaritons were excited at one end of the nanowire to achieve remote excitation of the whispering gallery modes (WGMs) of the microsphere.
2：Sample Selection and Data Sources:
Chemically synthesized silver nanowires in ethanol solution were dropcasted on a glass substrate, over which dye molecules coated microspheres were dropcasted.
3：List of Experimental Equipment and Materials:
A high numerical aperture objective lens (0.95 NA, 100×) was used to focus laser at one end of the nanowire for the generation of surface plasmon polaritons. The emission was studied using Fourier plane optical microscopy.
4：95 NA, 100×) was used to focus laser at one end of the nanowire for the generation of surface plasmon polaritons. The emission was studied using Fourier plane optical microscopy.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: After evaporation of the solvent, the sample contained capillary force assisted self-assembled microsphere coupled silver nanowire. The emission from the junction was spatially filtered and projected to the spectrometer or EMCCD placed at the Fourier plane of the objective lens.
5：Data Analysis Methods:
The spectral signature and wavevector distribution of the emission were analyzed. The directionality of emission was quantified using forward to backward ratio in dB.
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