1,720,963 research outputs found
Comparison between lithographic and holographic techniques for bidimensional periodical lattice realization
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1550 nm Volume Holography for Optical Communications Devices
No full textThe two-lambda method can provide a strategic approach to implement all-optical devices for communication wavelength division multiplexing (WDM) signal processing based on volume holography. By writing holograms at 488 nm in LiNbO/sub 3/:Fe and reading them in the third window of optical communication systems (1550 nm), the feasibility of WDM demultiplexers and holographic memories for digital bytes is here demonstrated
Diffraction of optical communication Gaussian beams by volume gratings: comparison between simulations and experimental results
No full textThe diffraction effects induced by a thick holographic grating on the propagation of a finite Gaussian beam are theoretically analyzed by means of the coupled-wave theory and the beam propagation method. Distortion of the transmitted and diffracted beams is simulated as a function of the grating parameters. Theoretical results are verified by experimentation realized by use of LiNbO3 volume gratings read out by a 1550-nm Gaussian beam, typical of optical fiber communications. This analysis can be implemented as a useful tool to aid with the design of volume grating-based devices employed in optical communications
Holographic bidimensional periodic structures in broadband-sensitive photoresist
No full textTwo-dimensional periodic arrays of submicrometric holes are implemented by means of multiple-exposure optical holography in a photoresist sensitive to the standard emission line (476 nm) of Argon laser. SEM acquisitions and diffractive characterizations at 1550 nm show the lattice quality and its capability to operate as fan-out optical device
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