We have realized a differential Near-field Scanning Optical Microscope (NSOM) working with subwavelength resolution in the THz spectral region. The system employs a quantum cascade laser emitting at lambda similar to 105 mu m as source, and the method, differently from conventional NSOM, involves diffracting apertures with size comparable to the wavelength. This concept ensures a higher signal-to-noise level at the expense of an additional computational step. In the implementation here reported lambda/10 resolution has been achieved; present limiting factors are investigated through finite difference time domain simulations. (C) 2009 Optical Society of America

Differential Near-Field Scanning Optical Microscopy with THz quantum cascade laser sources

TREDICUCCI, ALESSANDRO;
2009-01-01

Abstract

We have realized a differential Near-field Scanning Optical Microscope (NSOM) working with subwavelength resolution in the THz spectral region. The system employs a quantum cascade laser emitting at lambda similar to 105 mu m as source, and the method, differently from conventional NSOM, involves diffracting apertures with size comparable to the wavelength. This concept ensures a higher signal-to-noise level at the expense of an additional computational step. In the implementation here reported lambda/10 resolution has been achieved; present limiting factors are investigated through finite difference time domain simulations. (C) 2009 Optical Society of America
2009
Degl'Innocenti, R.; Montinaro, M.; Xu, J. H.; Piazza, V.; Pingue, P.; Tredicucci, Alessandro; Beltram, F.; Beere, H. E.; Ritchie, D. A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/495208
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