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EnglishWe 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 µm 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.
| Titolo: | Differential Near-Field Scanning Optical Microscopy with THz quantum cascade laser sources |
| Autori: | |
| Data di pubblicazione: | 2009 |
| Rivista: | |
| Parole Chiave: | scanning probe microscopy; near field; THz |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1364/OE.17.023785 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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