Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 70: Poster Session: Devices; Preparation and characterization; C/diamond; Si/Ge

HL 70.8: Poster

Mittwoch, 13. März 2013, 16:00–20:00, Poster A

Construction of a heterodyne nearfield optical microscope — •Jan Siebels, Jens Ehlermann, Lena Simone Fohrmann, and Stefan Mendach — University of Hamburg, Germany

Here we describe the technical realization of a phase-resolved scanning near field optical microscope. In general, the frequency of visible light oscillating between 384 THz and 789 THz is too fast to be detected directly with today*s electronics. In order to obtain information about the phase of light one can utilize heterodyne detection. In combination with a near field scanning optical microscope it is possible to directly detect the amplitude and phase of near field distribution on sample surfaces [1][2]. . The near-field microscopeis placed in one branch of a Mach-Zehnder like interferometer. The frequency of the laser beams within the two branches, i.e. reference and signal beam, is slightly shifted via acousto-optic modulators. As a result, the interference of the beams results in beating pattern which is demodulated with a Lock-in amplifier to retrieve amplitude and phase of the SNOM signal.

We gratefully acknowledge financial support of the Deutsche Forschungsgemeinschaft via the Graduiertenkolleg 1286.

[1] M.L.M. Balistreri, J. Korterik, K. Kuipers, and N. van Hulst, Phys. Rev. Lett. 85, 294 (2000)

[2] A. Nesci, R. Dändliker, and H.P. Herzig Optics Letters, Vol. 26, Issue 4, pp. 208-210 (2001)