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Date:         Thu, 3 Jan 2008 17:19:43 +0200
Reply-To:     Joe van Zwaren <[log in to unmask]>
Sender:       Optics Newsletter <[log in to unmask]>
From:         Joe van Zwaren <[log in to unmask]>
Subject:      OPTICS-L: TAU Phy EE Seminar by Dr. Michael Golub - Jan 17, 2008
Content-Type: multipart/mixed;

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From: Esther Zilka [log in to unmask] *TEL AVIV UNIVERSITY* *The seminar will take place on January 17, 2008 at 15.00, Room 206, Wolfson Faculty of Eng., Mech. Eng. Bldg*.(parking facing gate 14)** ** * * * * SEMINAR * * * * ** *Creation and characterization of complex light beams by diffractive, micro and nano-optical elements* *Dr. Michael Golub* Physical Electronics, School of Electrical Engineering, Tel Aviv University Classical optical design considers imaging and illumination systems essentially based on aberrated plane and spherical waves, whereas laser, fiber and integrated optics naturally give rise to Gaussian, Bessel, helical and other complicated light beams. There is a strong need of theoretical development, physical implementation and measurement of exotic light beams in the free space, waveguiding media, meta-materials and photonics structures. Modern technologies of precise mechanical processing, interferometry, planar lithography, laser ablation and magnetorheological finishing had already grown a strong support for beam transformation optics. Accordingly, nearly arbitrary shaped optical elements comprising aspherical surfaces, arrays of micro and nano-optical elements, graded index distributions, Bragg reflectors and diffractive grooves are now commercially available. However design of advanced optical elements, i.e. establishing relations between intrinsic optical parameters and required performance still have to provide an adequate response to the challenging needs of beam transformation and characterization. The lecture states a general problem of optical beam transformation with the aid of scalar and "rigorous" diffractive optical elements, and discusses a complex eikonal method for derivation of coherent beams in curvilinear coordinates. It is proposed to design diffractive optics, in the resonance diffraction domain, by an effective grating theory which is a generalization of the effective index theory towards surface relief Bragg gratings. Applications in retro-reflective diffraction gratings are presented. It is shown that an idea of optical correlation with complex light beams, gives rise to a bunch of advanced optical measurements techniques in free space, fibers and waveguides. Computer simulated and experimental results on measurements of the transverse modal power and phase distributions are presented. Applications of dispersive diffractive optical elements in spectral imaging by exploiting a spectral multiplexing and demultiplexing technique are discussed. The speaker has recently received the KAMEA Principle Research Associate appointment in TAU, under the auspices of Prof. Menachem Nathan and Prof. Shlomo Ruschin, and can be reached at telephone 5392 or by e-mail at [log in to unmask] . Refreshment will be served before the seminar
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