Differential near-field scanning optical microscopy with THz quantum cascade laser sources

Degl'Innocenti, Riccardo and Montinaro, M. and Xu, J. and Piazza, V. and Pingue, P. and Tredicucci, A. and Beltram, F. and Beere, H. E. and Ritchie, D. A. (2009) Differential near-field scanning optical microscopy with THz quantum cascade laser sources. Optics Express, 17 (26). pp. 23785-23792. ISSN 1094-4087

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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 λ ∼ 105 μ 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 λ/10 resolution has been achieved; present limiting factors are investigated through finite difference time domain simulations.

Item Type:
Journal Article
Journal or Publication Title:
Optics Express
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
89365
Deposited By:
Deposited On:
20 Dec 2017 14:50
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 11:07