A coherent photon scanning tunneling microscope is presented. The setup employs heterodyne interferometry, allowing both the phase and the amplitude of the optical near field to be measured. Experimental results of measurements on a standing evanescent wave reveal the high resolution that is obtainable with such an approach. In fact we have measured the amplitude and the phase of the near field, with a resolution of 1.6 nm between sample points.
© 2001 Optical Society of America
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(180.5810) Microscopy : Scanning microscopy
(240.7040) Optics at surfaces : Tunneling
Antonello Nesci, René Dändliker, and Hans Peter Herzig, "Quantitative amplitude and phase measurement by use of a heterodyne scanning near-field optical microscope," Opt. Lett. 26, 208-210 (2001)