Near-field microscope probe for far infrared time domain measurements
نویسندگان
چکیده
A near-field probe fabrication technique for far-infrared frequencies based on photoconducting antennas is developed. A subwavelength-size field source is accomplished by means of an aperture and protruding high refractive index tip. The near-field probe is tested by using free space traveling electromagnetic pulses with a broadband spectrum in the range of 0.3–1.5 THz. A spatial resolution of 60 mm is achieved for a 50 mm aperture. The described probe may be used for near-field transmission microscopy in illumination and collection modes. Resolution may be further improved by means of a smaller aperture. © 2000 American Institute of Physics. @S0003-6951~00!04630-1#
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