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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.
http://hdl.handle.net/11384/12648| Titolo: | Differential Near-Field Scanning Optical Microscopy with THz quantum cascade laser sources |
| Autori interni: | XU, Jihua BELTRAM, Fabio PINGUE, Pasqualantonio |
| Data di pubblicazione: | 2009 |
| Rivista: | OPTICS EXPRESS |
| 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 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. |
| Handle: | http://hdl.handle.net/11384/12648 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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