1,720,983 research outputs found
All-optical pattern recognition for digital real-time information processing
No full textTo recognize digital streams of digital data, all-optical and passive techniques able to discriminate optical bit words in real time are presented. Discrimination capability of different correlators, both in free space architectures and in delay lines structures, is theoretically and experimentally analyzed. Experimental performances in word recognition are shown in the case of a volume holographic correlator, in the case of a lithographic phase-only-filter correlator, and in the case of a novel coherent delay lines correlator operating at the wavelength 1550 nm and at the bit rate of 2.5 Gbit/s
Sperimentazione di CDMA spettrale mediante reticoli di bragg in fibra accordabili in lunghezza d'onda
No full text
Molecular roughness analysis of development resist by LER method
No full textIn this paper, line edge roughness (LER) analysis on top–down images acquired by means of a scanning electron microscope is here proposed as a powerful and non-invasive technique to map the molecular aggregate distribution in a chemically amplified resist: in particular the periodicity of the aggregates themselves is determined via power spectral density method (PSD). The roughness of two resist developers with different chemical composition will be compared on the base of 1D power spectral density function: in case of SEM acquisition, the profile to be analyzed is extracted from a top–down acquisition, while atomic force microscope (AFM) inspection of surface topography allows to calculate PSD along a user-defined line. The two approaches confirm a reduced surface roughness in case of development with smaller molecule
Sistema di misura per sensori in fibra ottica a reticolo di Bragg
No full textWe present an innovative and low-cost system for interrogating the cascade of optical sensors based on fiber Bragg grating by exploiting the capabilities of telecommunication components realized in integrated optic SOI technology
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