Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
<mark>Journal publication date</mark> | 21/12/2009 |
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<mark>Journal</mark> | Optics Express |
Issue number | 26 |
Volume | 17 |
Number of pages | 8 |
Pages (from-to) | 23785-23792 |
Publication Status | Published |
<mark>Original language</mark> | English |
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.