Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: New Instruments and Methods

CPP 8.8: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Dynamic SEM image analysis of vibrating cantilevers (I) — •Maria-Astrid Schröter¹, Matthias Holschneider², Christiane Weimann¹, Martin Ritter³, and Heinz Sturm¹ — ¹BAM 6.9, Federal Inst. Materials Research, Berlin — ²Inst. Mathematics, Univ. Potsdam — ³Electron Microscopy TU Hamburg-Harburg

SFM cantilevers excited to vibration are used to perform intermittent- or non-contact modes or serve in force modulation techniques and derivatives thereof. Even sub-atomic resolution was demonstrated already. Advanced techniques include multi-frequency excitation for the use of higher modes to improve sensitivity or to examine tip-sample interactions related to materials properties. In all methods, non-linear effects can appear giving rise to harmonics of excitation frequency. The technique presented here named Dynamic Scanning Electron Microscopy (DySEM) enables us to image shapes of vibrating structures in different modes in terms of amplitude and phase shift measured by a lock-in amplifier (1,2). Our contribution concentrates on experimental issues and in this is part (I) the method is introduced and pictures of different modes and harmonics are presented. For the first time, the resulting motion induced by multiple frequency excitation (f₁, f₂) is imaged at the sum (f₁+f₂) and difference (f₁-f₂) frequency. The mathematical analysis and a new developed model is presented in a second poster (II).

(1) Schröter, Holschneider, Sturm; Nanotechn. 23, 435501 (2012).

(2) Sturm, Schröter, Weimann; Microelectr. Eng. 98, 492 (2012).