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

Yue Zhang; Fangfang Wen; Samuel Gottheim; Nicholas S. King; Yu Zhang; Peter Nordlander; Naomi J. Halas

doi:10.1117/12.2186474

5 October 2015 NIR and MIR charge transfer plasmons in wire-bridged antennas (Presentation Recording)

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

Proceedings Volume 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII; 95470J (2015) https://doi.org/10.1117/12.2186474
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

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.

Conference Presentation

Citation Download Citation

Yue Zhang, Fangfang Wen, Samuel Gottheim, Nicholas S. King, Yu Zhang, Peter Nordlander, and Naomi J. Halas "NIR and MIR charge transfer plasmons in wire-bridged antennas (Presentation Recording)", Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95470J (5 October 2015); https://doi.org/10.1117/12.2186474

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Plasmons

Plasmonics

Nanostructures

Antennas

Finite-difference time-domain method

Infrared spectroscopy

Near infrared

Show All Keywords

Keywords/Phrases

Search In:

Publication Years