3 μm aperture probes for near-field terahertz transmission microscopy

Macfaden, Alexander J.; Reno, John L.; Brener, Igal; Mitrofanov, Oleg
January 2014
Applied Physics Letters;1/6/2014, Vol. 104 Issue 1, p011110-1
Academic Journal
The transmission of electromagnetic waves through a sub-wavelength aperture is described by Bethe's theory. This imposes severe limitations on using apertures smaller than ~1/100 of the wavelength for near-field microscopy at terahertz (THz) frequencies. Experimentally, we observe that the transmitted evanescent field within 1 μm of the aperture deviates significantly from the Bethe dependence of E∝a3. Using this effect, we realized THz near-field probes incorporating 3 μm apertures and we demonstrate transmission mode THz time-domain near-field imaging with spatial resolution of 3 μm, corresponding to λ/100 (at 1 THz).


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