期刊
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
卷 14, 期 2, 页码 470-475出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTQE.2007.910560
关键词
aperture scanning near-field optical microscopes (SNOM); near-field imaging; submillimeter spectroscopy; terahretz (THz) image contrast; THz spectroscopy
资金
- Deutsche Forschungsgemeinschaft (DFG) [Dr228/24-2]
- Landesstiftung Baden-Wurttemberg
We compare different near-field methods operating in the frequency range between 50 GHz and 1.5 THz with respect to their application potential for terahertz-micro-spectroscopy. Scan ning near-field optical microscopes (SNOMs) can be divided into two basic principles: aperture SNOMs using a small pinhole and apertureless SNOMs, where a small scatterer acts as a near-field probe. As an alternative method, we include in our comparison a microscope based on a solid immersion lens. Most of these techniques are well known in the visible and infrared range, where they are mainly utilized to reach a high spatial resolution. In real samples, the physics behind the observed image contrast is often unclear, and therefore, additional spectroscopic information on a subwavelength spot size is desired. In this paper, we discuss different microscopic techniques in respect of their micro-spectroscopic potential in the THz range.
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