Title :
THz transmission near-field imaging with very high spatial resolution
Author :
Mitrofanov, O. ; Harel, R. ; Lee, M. ; Pfeiffer, L.N. ; West, K.W. ; Wynn, J.D. ; Federici, J.
Author_Institution :
Lucent Technol. Bell Labs., Murray Hill, NJ, USA
Abstract :
Summary form only given. Scanning near-field microscopy at THz frequency regime is a developing technology and different approaches have been proposed to improve spatial resolution. Recently a sensitive near-field probe that integrates a subwavelength aperture and a photoconducting switch was demonstrated. Spatial resolution of this method is defined by the probe aperture size and limited by signal attenuation. In this study we discuss attenuation of single-cycle THz pulses for various aperture sizes (10-50 /spl mu/m). The near-field probe with the 10 gm aperture provides spatial resolution of /spl sim/10 /spl mu/m at the wavelength range from 120 to 1500 /spl mu/m. To our knowledge, it is the highest resolution achieved with THz pulses in this spectral range. Near-field images can be constructed with signal to noise ratio of /spl sim/50.
Keywords :
near-field scanning optical microscopy; submillimetre wave imaging; submillimetre wave spectroscopy; time resolved spectroscopy; 0.2 to 2.5 THz; 120 to 1500 micron; collection mode aperture type probe; photoconducting switch; scanning near-field microscopy; single-cycle pulses; subwavelength aperture; terahertz transmission near-field imaging; time-domain spectroscopy setup; very high spatial resolution; Apertures; Attenuation; Frequency; High-resolution imaging; Microscopy; Photoconductivity; Probes; Signal resolution; Spatial resolution; Switches;
Conference_Titel :
Lasers and Electro-Optics, 2001. CLEO '01. Technical Digest. Summaries of papers presented at the Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-662-1
DOI :
10.1109/CLEO.2001.948114