Abstract
In this presentation we discuss application of broadband terahertz (THz) time-domain spectroscopy for probing subwavelength (micrometer) size objects. The problem of weak coupling between THz waves and sub-wavelength objects, which limits the use of THz spectroscopy to large samples, is mitigated by employing surface plasmon waves. In one implementation, THz surface waves, excited on a broad-band planar THz bow-Tie antenna, are used to enhance the interaction with a small particle placed on the antenna surface. The surface field distribution near the particle is mapped with an integrated sub-wavelength aperture THz near-field probe. We demonstrate that imaging and probing of the subwavelength size dielectric particles (TiO2 and SrTiO3) can be realized using the enhanced THz field between the antenna and the probe. We also discuss THz wave confinement using two sharp metallic needles. We demonstrate that in the near-field region of the needle tips, the electric field of THz pulses is concentrated to a volume smaller than (10 μm)3 without limiting the THz pulse bandwidth. Application of both methods for high spatial resolution imaging and spectroscopy will be discussed..
Original language | English |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Publisher | Society of Photo-Optical Instrumentation Engineers |
Volume | 8993 |
ISBN (Print) | 9780819499066 |
DOIs | |
Publication status | Published - 2014 |
Event | Quantum Sensing and Nanophotonic Devices XI - San Francisco, CA, United States Duration: 2 Feb 2014 → 6 Feb 2014 |
Conference
Conference | Quantum Sensing and Nanophotonic Devices XI |
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Country/Territory | United States |
City | San Francisco, CA |
Period | 2/02/14 → 6/02/14 |
Keywords
- near-field microscopy
- plasmons
- surface waves
- terahertz
- time-domain spectroscopy
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics