Dr. Raphael Guerrero of the Ateneo Photonics Laboratory presents a paper in the 2010 SPIE Optics and Photonics Conference in San Diego, California

Dr. Raphael Guerrero attended the conference on “Polymer Optics Design, Fabrication, and Materials II” at SPIE Optics and Photonics Conference in San Diego, California last Aug 1 to 5, 2010. The venue was the San Diego Convention Center.

SPIE is the international society for optics and photonics founded in 1955 to advance light-based technologies. The society has 180,000 constituents from 168 countries. The Society advances emerging technologies through interdisciplinary information exchange, continuing education, publications, patent precedent, and career and professional growth. Every year, SPIE organizes and sponsors approximately 25 major technical forums, exhibitions, and education programs in North America, Europe, Asia, and the South Pacific.

The title of Dr. Guerrero’s talk is ” Beam scanning and color display with an elastomeric grating actuated by a shape memory alloy”, which was co-authored with Michelle Sze and Joby Batiller, both alumni of the Photonics Laboratory. In their work, Dr. Guerrero’s team fabricated a tunable diffraction grating by embedding a nitinol wire within an
elastomeric grating replica. A diffraction grating is parallel series of linear grooves etched on a surface. If this structure is closely spaced enough, as in compact discs, a rainbow of colors gets reflected from the surface. But instead of metal compact discs, they used an elastomer, a polymer used in waterproofing paints and water sealants. To change the the curvature of the grating, they heat the wire inside the polymer, making the wire increase in length due to thermal expansion. By changing the curvature of the grating, they were able to change the direction of the diffracted beam. With 2.0 A of applied current, the 1st-order beam sweeps a diffraction angle range of 15.8 deg in approximately 40 seconds. This technology shows promise in the use of selective color displays.

The Ateneo Photonics Laboratory now has two ISI papers for 2010:

R. A. Guerrero, M. W. C. Sze, and J. R. A. Batiller, “Deformable curvature and beam scanning with an elastomeric concave grating actuated by a shape memory alloy,” Applied Optics V49 N19, 3634-3639 (2010).

R. A. Guerrero and E.B. Aranas, ?Diffraction from relief gratings on a biomimetic elastomer cast,? Mater. Sci. Eng. C, http://dx.doi.org/10.1016/j.msec.2010.06.017 (article in press).

Here are some pictures of Dr. Guerrero:

Fig. 1.  Dr. Guerrero discussing the research efforts of the Ateneo Photonics Laboratory on elastomeric optics.  The photo is courtesy of Dr. Vincent Daria.

Fig. 2.  In the conference, Dr. Guerrero (left) had lunch with Dr. Vincent Daria (center) of University of the Philippines and Dr. Minella Alarcon (right), the former chair of the Ateneo Physics Department and the head of UNESCO’s Active Learning in Optics and Photonics Project which recently got an award from SPIE.

Fig. 3.  After the SPIE conference, Dr. Guerrero visited the San Diego Zoo.  Dr. Guerrero had a great time in San Diego.

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Physics News and Features from Ateneo de Manila University

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