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
Autori interni: | |
Autori: | Degl'Innocenti R.; Montinaro M.; Xu J.-H.; Piazza V.; Pingue P.; Tredicucci A.; Beltram F.; Beere H. E.; Ritchie D. A. |
Titolo: | Differential Near-Field Scanning Optical Microscopy with THz quantum cascade laser sources |
Anno del prodotto: | 2009 |
Digital Object Identifier (DOI): | 10.1364/OE.17.023785 |
Appare nelle tipologie: | 1.1 Articolo in rivista |