Guerrero and Oliva 2014: Optical wavelength tuning via actuation of a fluidic grating

Raphael A. Guerrero* and Sarah Jaye C. Oliva, Optical wavelength tuning via actuation of a fluidic grating, Optical Engineering 53(2), 025104 (February 2014)

*Ateneo de Manila University, Department of Physics, Loyola Heights, Quezon City 1108, Philippines

Abstract

Deformable optical elements may be physically altered through fluid displacement. We imprint a grating surface onto an elastomeric membrane by soft lithography. The membrane is installed as a flexible wall of a sealed fluidic chamber. Injection of excess fluid into the chamber induces expansion of the membrane, effectively varying the groove spacing of the imprinted grating. In transmission experiments using a broadband light source, we are able to achieve a 127.2-nm shift in peak wavelength with an injected fluid volume of 0.56 ml. A paraboloid model of the change in curvature of the grating during expansion accurately describes our experimental results. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE) [DOI: 10.1117/1.OE.53.2.025104]

Keywords: diffractive optical elements; polymers; optical devices.

Paper 131326 received Aug. 28, 2013; revised manuscript received Jan. 13, 2014; accepted for publication Jan. 23, 2014; published online Feb. 20, 2014.

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Ateneo Physics faculty Dr. Raphael A. Guerrero is NAST Outstanding Young Scientist and TWAS Prize awardee for 2013

MS Physics Thesis Defense: “Analysis of the Reflectance Function for the Investigation of Biological Optical Filters” by Erika Aranas

The Department of Physics cordially invites you to the Thesis Defense of Ms. Erika Aranas on Monday, 11 February 2013, 3:00-5:00 pm, at Faura 318. Erika’s thesis adviser is Dr. Raphael Guerrero, coordinator of the Photonics Laboratory.

Title: Analysis of the Reflectance Function for the Investigation of Biological Optical Filters

Abstract:

Electromagnetic wave propagation in one-dimensional periodic media may be described using classical interference theory and modern photonic crystal theory. Both approaches may be employed in the investigation of laminated optical structures responsible for iridescence in beetles. Convergence of the two frameworks in the limit as the number of layers approach infinity is shown. Without relying on cumbersome absolute reflectance measurements and low-resolution micrographs, design parameter extraction was conducted based on angle-dependent peak wavelengths derived from relative reflectance experiments and other known parameters. In particular, the new band gap condition, formulated using the classical model, and the infinite layer approximation, facilitated the retrieval calculations.