Interface applications of scanning near-field optical microscopy with a free electron laser

The study of semiconductor interfaces and of solid interfaces in general requires novel instrument capable to investigate the lateral fluctuations of properties on a microscopic scale. We present the first result of a major effort in that framework, whose main objective is the exploitation of the unique characteristics of free electron laser (FEL) infrared sources. The background was provided by our previous development of FEL-based techniques to measure interface barriers with high accuracy and reliability. Quite recently, we were able to implement similar investigations with high lateral resolution. The key elements were the use of a small-tip optics fiber and its coupling with a scanning module; in this way, we achieved and verified the condition of near-field microscopy including a lateral resolution much below the wavelength value. Our discussion includes a presentation of the first scanning near-field optical microscopy (SNOM) images obtained with an FEL and data on small and microscopic-scale fluctuations of semiconductor interface barriers. The likely development of this exciting new field will also be discussed, in particular considering the new proposals for powerful FELs in the low-wavelength spectral range.

Published in:
Physica Status Solidi a-Applied Research, 175, 1, 317-329
CNR, Ist Stuttura Mat, I-00133 Rome, Italy. Ecole Polytech Fed Lausanne, Inst Phys Appl, CH-1015 Lausanne, Switzerland. Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. Univ La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. Univ Franche Comte, Lab Opt, F-25030 Besancon, France. USN, Res Lab, Div Opt Sci, Washington, DC 20375 USA. Cricenti, A, CNR, Ist Stuttura Mat, Via Fosso Cavaliere 100, I-00133 Rome, Italy.
ISI Document Delivery No.: 244NZ

 Record created 2006-10-03, last modified 2018-03-18

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