Thomas J. Suleski
University of North Carolina at Charlotte
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Featured researches published by Thomas J. Suleski.
Applied Optics | 1995
Thomas J. Suleski; Donald C. O'Shea
Fabrication of diffractive optics with binary masks requires multiple photolithographic processes to produce high-efficiency elements. Alignment or etching errors at any stage of fabrication decrease the efficiency of the element. We developed an easily accessible procedure that reduces fabrication complexity and costs by using a single gray-scale mask. The gray-scale patterns are generated by commercial slide imagers and are then photoreduced onto low-contrast film plates. Multiple-level or continuous relief structures (kinoforms) may be constructed by use of the photoreduced gray-scale patterns as lithographic masks. Diffractive-optic lenses and blazed gratings were fabricated in photoresist with this procedure. First-order diffraction efficiencies as high as 85% were measured for the blazed gratings. The advantages and the limitations of this technique are discussed.
Applied Optics | 1997
Thomas J. Suleski
A systematic analysis has been performed that predicts the existence of 36 cases in which 100% modulated, square-wave irradiance distributions can be generated in the Fresnel regime by simple binary-phase gratings. These types of distributions, referred to here as Lohmann images, have been previously predicted by researchers studying phase gratings known as Talbot array illuminators. Twenty of the cases are reported, to the best of my knowledge, for the first time. Sixteen of these new cases result in Lohmann images with twice the spatial frequency of the original grating. Experimental verifications of the theoretical predictions are presented.
Intelligent Integrated Microsystems | 2006
Nikos P. Pitsianis; David J. Brady; Andrew D. Portnoy; Xiaobai Sun; Thomas J. Suleski; Michael A. Fiddy; Michael R. Feldman; Robert D. TeKolste
This paper describes a compressive sensing strategy developed under the Compressive Optical MONTAGE Photography Initiative. Multiplex and multi-channel measurements are generally necessary for compressive sensing. In a compressive imaging system described here, static focal plane coding is used with multiple image apertures for non-degenerate multiplexing and multiple channel sampling. According to classical analysis, one might expect the number of pixels in a reconstructed image to equal the total number of pixels across the sampling channels, but we demonstrate that the system can achieve up to 50% compression with conventional benchmarking images. In general, the compression rate depends on the compression potential of an image with respect to the coding and decoding schemes employed in the system.
Journal of Lightwave Technology | 2005
Thomas J. Suleski; Robert Te Kolste
In this paper, we discuss likely trends for manufacturing of free-space microoptics, focusing primarily on diffractive and refractive components. A brief historical overview of microoptics fabrication is presented, followed by our predictions on the future of the field. Examples of future applications, technical challenges, and supporting technologies required for manufacturing of different types of microoptics are discussed.
Journal of The Optical Society of America A-optics Image Science and Vision | 2010
Brent C. Bergner; Thomas A. Germer; Thomas J. Suleski
Line edge roughness (LER) has been identified as a potential source of uncertainty in optical scatterometry measurements. Characterizing the effect of LER on optical scatterometry signals is required to assess the uncertainty of the measurement. However, rigorous approaches to modeling the structures that are needed to simulate LER can be computationally expensive. In this work, we compare the effect of LER on scatterometry signals computed using an effective medium approximation (EMA) to those computed with realizations of rough interfaces. We find that for correlation lengths much less than the wavelength but greater than the rms roughness, an anisotropic EMA provides a satisfactory approximation in the cases studied.
Optics Letters | 1999
Thomas J. Suleski; Betty Baggett; William F. Delaney; Charles S. Koehler; Eric G. Johnson
We demonstrate an innovative method for fabrication of high-spatial-frequency grating structures. This technique makes use of the near-field diffraction patterns from computer-generated phase holograms for lithographic fabrication of grating structures with periods that are one half that of the phase hologram mask. Linear, rectilinear, and circular gratings were fabricated with this technique. Experimental results from gratings with periods to 0.5 mum and feature sizes to ~0.2 mum are presented.
Optical Engineering | 2012
Paul J. Smilie; Brian S. Dutterer; Jennifer L. Lineberger; Matthew A. Davies; Thomas J. Suleski
While Alvarez lens prototypes have recently been manufactured and tested for visible wavelengths, there is little discussion of these types of components for infrared applications in the published literature. We present and characterize a germanium Alvarez lens for infrared imaging. Mathematical analysis for determining the required cubic surfaces is presented, and ray-based and wave-based optical simulations are performed to confirm and refine the expected variable-focus behavior. As part of the design study, we examine the effects of effective f-number of the Alvarez lens and gap between the freeform surfaces on image quality, modulation transfer function, and Strehl ratio. The germanium Alvarez lens pair is fabricated through freeform diamond micro-milling, and characterized using a custom-built imaging test station in the mid-infrared. The variable-focus and imaging capabilities of this lens are demonstrated experimentally and compared to predicted results with good agreement.
Biomedical Optics Express | 2014
Jinxin Huang; Qun Yuan; Buyun Zhang; Ke Xu; Patrice Tankam; Eric Clarkson; Matthew A. Kupinski; Holly B. Hindman; James V. Aquavella; Thomas J. Suleski; Jannick P. Rolland
To extend our understanding of tear film dynamics for the management of dry eye disease, we propose a method to optically sense the tear film and estimate simultaneously the thicknesses of the lipid and aqueous layers. The proposed method, SDT-OCT, combines ultra-high axial resolution optical coherence tomography (OCT) and a robust estimator based on statistical decision theory (SDT) to achieve thickness measurements at the nanometer scale. Unlike conventional Fourier-domain OCT where peak detection of layers occurs in Fourier space, in SDT-OCT thickness is estimated using statistical decision theory directly on the raw spectra acquired with the OCT system. In this paper, we demonstrate in simulation that a customized OCT system tailored to ~1 µm axial point spread function (FWHM) in the corneal tissue, combined with the maximum-likelihood estimator, can estimate thicknesses of the nanometer-scale lipid and micron-scale aqueous layers of the tear film, simultaneously, with nanometer precision. This capability was validated in experiments using a physical phantom that consists of two layers of optical coatings that mimic the lipid and aqueous layers of the tear film.
Optics Letters | 2011
Paul J. Smilie; Thomas J. Suleski
We propose a refractive two-element system that converts the gaussian irradiance of an incident laser beam into a nominally flat-top output spot at a given distance with the capability to vary the spot diameter. The elements are high-order freeform surfaces that, when laterally translated, form a variable composite beam shaper. The general approach for determining the required freeform surfaces is discussed, and example design results are presented.
Proceedings of SPIE | 2009
Brent C. Bergner; Thomas A. Germer; Thomas J. Suleski
Line width roughness (LWR) has been identified as a potential source of uncertainty in scatterometry measurements, and characterizing its effect is required to improve the methods accuracy and to make measurements traceable. In this work, we extend previous work by using rigorous coupled wave (RCW) analysis on two-dimensionally periodic structures to examine the effects of LWR. We compare the results with simpler models relying upon a number of effective medium approximations. We find that the effective medium approximations yield an approximate order of magnitude indicator of the effect, but that the quantitative agreement may not be good enough to include in scatterometry models.