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Spatial impulse response of lithographic infrared antennas
C Fumeaux1, G D Boreman, W Herrmann
1Department of Electrical Engineering, Center for Research and Education in Optics and Lasers, University of Central Florida, Orlando, Florida 32816-2700, USA. cfumeaux@creol.ucf.edu
Applied Optics
|February 29, 2008
Summary
We measured the spatial response of infrared antennas using focused 10.6-micrometer radiation. The antenna’s response extends beyond the metal, crucial for calculating collected power and understanding wave propagation.
Area of Science:
- Plasmonics
- Nanophotonics
- Infrared Spectroscopy
Background:
- Lithographic antennas are crucial for manipulating light at the nanoscale.
- Understanding their spatial response is key to optimizing device performance.
Purpose of the Study:
- To measure and characterize the spatial response of infrared dipole and bow-tie antennas.
- To determine how the antenna's physical structure influences its light-collecting capabilities.
Main Methods:
- Focused 10.6-micrometer infrared radiation was used to probe the antennas.
- Two-dimensional scanning across the antenna's receiving area was performed.
- Deconvolution techniques were applied to the beam profile for accurate spatial response measurement.
Main Results:
- The spatial response of the antennas was successfully measured.
- The in-plane width of the spatial response was found to extend approximately one dielectric wavelength beyond the metallic structure.
- The measurements provide a basis for calculating collected power and understanding antenna operation.
Conclusions:
- The spatial response is a critical parameter for infrared antenna design and application.
- Accurate measurement of spatial response is essential for determining antenna responsivity and noise-equivalent power.
- The results offer insights into near-field interactions and wave propagation on antennas.
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