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A Multimodal Wide-Field Fourier-Transform Raman Microscope

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Planar infrared binary phase reflectarray.

James Ginn¹, Brian Lail, Javier Alda

¹CREOL-The College of Optics and Photonics, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816, USA. jcginn@creol.ucf.edu

|April 17, 2008

Summary

Researchers demonstrated a novel infrared reflectarray using subwavelength metallic patches. This approach offers flexible phase control for optical surfaces, avoiding complex dielectric structures.

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Area of Science:

Optics and Photonics
Metamaterials
Infrared Technology

Background:

Reflective optical elements like Fresnel zone plates typically rely on varying dielectric thickness to achieve phase shifts.
Existing methods for infrared optics can be complex and limited in their ability to create precise phase distributions.

Purpose of the Study:

To demonstrate a binary phase reflectarray operating in the infrared spectrum (10.6 microm).
To present an alternative method for achieving phase shifts using subwavelength metallic patches, enabling flexible optical surface design.

Main Methods:

Utilizing an array of subwavelength metallic patches on a dielectric stand-off layer backed by a ground plane.
Fabricating the reflectarray using two-dimensional lithography techniques.
Operating and characterizing the reflectarray at a wavelength of 10.6 microm.

Main Results:

Successfully demonstrated a reflective, binary phase reflectarray in the infrared.
Achieved desired phase shifts by controlling the dimensions of subwavelength metallic patches.
Showcased the potential for multilevel or continuous phase variations across the optical surface.

Conclusions:

The subwavelength metallic patch reflectarray is a viable alternative to traditional dielectric-based infrared optical elements.
This approach offers inherent flexibility for designing optical surfaces with tailored phase distributions.
The demonstrated technique simplifies fabrication by avoiding the need for dielectric height variations.