Dr. Yu Zhang Profile

Dr. Yu Zhang

Graduate Student at Rice Univ

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Proceedings Article | 5 October 2015 Presentation

NIR and MIR charge transfer plasmons in wire-bridged antennas (Presentation Recording)

Yue Zhang, Fangfang Wen, Samuel Gottheim, Nicholas King, Yu Zhang, Peter Nordlander, Naomi Halas

Proceedings Volume 9547, 95470J (2015) https://doi.org/10.1117/12.2186474

KEYWORDS: Nanoantennas, Plasmons, Plasmonics, Nanostructures, Near infrared, Antennas, Visible radiation, Infrared spectroscopy, Finite-difference time-domain method, Optical properties

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We investigate optical properties of wire-bridged plasmonic nanoantennas. Here we found two spectral features: a dipolar plasmon in the visible and a Charge Transfer Plasmon (CTP) in the infrared. The CTP depends sensitively on the conductance of the junction wire, offering a controllable way for tuning the plasmon resonance to the desired wavelength regime via junction geometries. Here we use single-particle dark field spectroscopy from UV, visible to IR to identify plasmonic modes in different spectrum regimes. The simulations using Finite-difference time-domain (FDTD) method are in good agreement with experiment: Increasing the junction wire width and concurrently the junction conductance blue shifts resonance positions, and simultaneously modifies scattering strengths, the linewidth of CTP and dipolar plasmon. We notice that CTP in a much longer wavelength regime and preserving a narrow line width, an important implication for designing IR plasmons with a high quality factor for enhanced spectroscopy and sensing applications. We also extend the CTP to the IR regime by increasing the wire length to create IR plasmon while keeping the line width of the resonance. Our work offers a way for studying the charge transfer properties in plasmonic nanostructures. Not only it adds another degree in understanding the charge transfer properties in plasmonic nanostructures but also offers an optical platform for studying molecules transport at optical frequencies and related applications.

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