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
Full text not available from this repository.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.