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83 results on '"Schmidt, Greg R."'

1. Engineered bacteria that self-assemble ″bioglass″ polysilicate coatings display enhanced light focusing

Author

Sidor, Lynn M., primary, Beaulieu, Michelle M., additional, Rasskazov, Ilia, additional, Acarturk, B. Cansu, additional, Ren, Jie, additional, Kamoen, Lycka, additional, Vitali, María Vázquez, additional, Carney, P. Scott, additional, Schmidt, Greg R., additional, Srubar, Wil V., additional, Abbondanzieri, Elio A., additional, and Meyer, Anne S., additional

Published
2024
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5. Gradient-index Alvarez lenses

Author

Lippman, David H., primary, Schmidt, Greg R., additional, Bentley, Julie L., additional, Moore, Duncan T., additional, Akhavan, Hooman, additional, Harmon, John Paul, additional, and Williams, George M., additional

Published
2023
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7. Measurement of Linear Coefficient of Thermal Expansion and Temperature-Dependent Refractive Index Using Interferometric System

Author

Corsetti, James A, Green, William E, Ellis, Jonathan D, Schmidt, Greg R, and Moore, Duncan T

Subjects
Optics
Abstract

A system combining an interferometer with an environmental chamber for measuring both coefficient of thermal expansion (CTE) and temperature-dependent refractive index (dn/dT) simultaneously is presented. The operation and measurement results of this instrument are discussed.

Published
2017

18. Replacing optical surfaces with gradient index functions which preserve ray trajectory

Author

Kochan, Nicholas S., Schmidt, Greg R., and Moore, Duncan T.

Abstract

Laws of reflection and refraction between homogeneous media and gradient index (GRIN) ray behavior are both derived from Fermat’s principle. Design methods for GRIN can be difficult to analytically develop. This Letter proposes a foundation for complete replacement of refracting and total internally reflecting optical interfaces in existing designs with GRIN distribution. The proposed method can aid in incorporating GRIN into existing optical designs. Refraction in GRIN is specified to match the ray striking and leaving the optical interface in both position and angle. This result is shown for a collection of similar GRIN functions. One GRIN function is analyzed over a full space of attainable ray bend angles. A local arbitrarily oriented planar interface is replaced with GRIN distribution, and ray behavior is maintained.

Published
2022

19. Freeform gradient index progressive addition lens raytrace performance evaluation

Author

Kochan, Nicholas S., Schmidt, Greg R., and Moore, Duncan T.

Abstract

Raytrace evaluation capable of evaluating progressive addition lens (PAL) designs with freeform surface and gradient index (GRIN) contributions is presented. The method is validated on an analytically generated PAL start design and on optimized surface designs. Surface raytrace evaluations are compared with the surface-geometric evaluation commonly presented for freeform surface PAL designs. The evaluation is also tested on analytically generated freeform GRIN PAL designs with spherical and plano surfaces. The raytrace method agrees with the analytic performance and surface-geometric performance near the center of the lens and deviates at the edge of the lens, due to ray obliquity with the surfaces and aggregate contributions of surfaces and/or GRIN. These deviations are expected, as the raytrace model accounts for more physical contributions to optical performance, including pupil diameter and eye position. This raytrace method enables the evaluation of lens performance contributions other than from polished surfaces on homogeneous materials, enabling further exploration of GRIN in PAL designs.

Published
2022

20. Polychromatic annular folded lenses using freeform gradient-index optics

Author

Lippman, David H., Chou, Robert, Desai, Ankur X., Kochan, Nicholas S., Yang, Tianyi, Schmidt, Greg R., Bentley, Julie L., and Moore, Duncan T.

Abstract

The annular folded lens (AFL) is a design form offering large aperture, high-resolution imaging in a very axially compact package. The folded optic can be made monolithic for easier fabrication and alignment, yet the introduction of refractive surfaces with a dispersive optical material gives way to chromatic aberrations. AFL designs using homogeneous media are generally limited to the monochromatic regime, with polychromatic performance greatly reduced. By introducing freeform gradient-index (F-GRIN) media, monolithic AFL designs can achieve higher monochromatic performance as well as provide color correction for diffraction-limited polychromatic imaging. Monochromatic and polychromatic design methodologies are surveyed where the F-GRIN is constrained to remain feasible for fabrication.

Published
2022

27. ALON GRIN optics for visible-MWIR applications

Author

Nag, Nagendra, additional, Jha, Santosh, additional, Sastri, Suri, additional, Goldman, Lee M., additional, McCarthy, Peter, additional, Schmidt, Greg R., additional, Bentley, Julie L., additional, and Moore, Duncan T., additional

Published
2016
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28. Optical design study of a VIS-SWIR 3X zoom lens

Author

Berman, Rebecca, additional, Corsetti, James A., additional, Fang, Kejia, additional, Fenning, Eryn, additional, McCarthy, Peter, additional, Schmidt, Greg R., additional, Visconti, Anthony J., additional, Williams, Daniel J. L., additional, Yee, Anthony J., additional, Zhao, Yang, additional, Bentley, Julie, additional, Moore, Duncan T., additional, and Olson, Craig, additional

Published
2015
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33. Compound optical arrays and polymer tapered gradient index lenses

Author

Schmidt, Greg R. (1979 - ), Moore, Duncan T., Schmidt, Greg R. (1979 - ), and Moore, Duncan T.

Abstract

Thesis (Ph. D.)--University of Rochester. Institute of Optics, 2009., In nature, the compound eye is the most common micro optical vision system. Artificial ‘bio-inspired’ systems are still in the early stages of research. This thesis examines the optical systems of biological compound eyes and presents solutions for developing artificial systems that operate similar to their natural counterparts. Methods for controlling the angular response using geometric principles are developed and demonstrated for apposition and neural superposition compound arrays types. The design methods are applied to the fabrication of a prototype artificial apposition system based on a real world guidance system. Many compound eyes in nature have a gradient index component in the optical system. The gradient index can also be used as a variable in the design of artificial systems. This thesis examines several gradient index profiles in conical shapes that are similar to natural the gradient index profiles found in the crystalline cones of natural systems. The imaging properties of these profiles is unknown, and their behavior is assessed by comparing them to radial gradient index rods and tapered radial gradient index fibers, that are well known and used in current technology. A process for fabricating these conical gradient index profiles in polymers is presented that uses a liquid diffusion exchange process. The DAIP (diallyl isophthalate, n = 1.57) CR-39 (diethylene glycol bis allyl carbonate n = 1.5) copolymer pair produced a close fit to the quadratic radial profile of gradient index rods, and demonstrated flexibility for further control over the profile. The radial and axial gradient index profiles of the DAIP CR-39 sample are compared to a model with Fickian diffusion and a constant diffusion coefficient, and found to closely match the theoretical case.

Published
2010

40. Compact spectrum splitting photovoltaic module with high efficiency

Author

McCambridge, James D., primary, Steiner, Myles A., additional, Unger, Blair L., additional, Emery, Keith A., additional, Christensen, Eric L., additional, Wanlass, Mark W., additional, Gray, Allen L., additional, Takacs, Laszlo, additional, Buelow, Roger, additional, McCollum, Timothy A., additional, Ashmead, James W., additional, Schmidt, Greg R., additional, Haas, Alex W., additional, Wilcox, John R., additional, Van Meter, James, additional, Gray, Jeffery L., additional, Moore, Duncan T., additional, Barnett, Allen M., additional, and Schwartz, Richard J., additional

Published
2010
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42. A SELECTED BIBLIOGRAPHY ON THE SOCIOLOGY OF AGING.

Author

Schmidt, Greg R.

Abstract

Over the past generation, scholarship on the sociology of aging has become a fertile field of study. This brief bibliography captures a sample of the ideas, knowledge, and directions that have appeared in the literature from the past ten years. It is by no means a complete listing of the wide range of topics and methods that characterize the sociological inquiry into aging. Instead, this bibliography serves as a springboard for further inquiry into both the scholars and scholarship providing a sociological lens on aging. [ABSTRACT FROM AUTHOR]

Published
2015

48. ALON GRIN optics for visible-MWIR applications

Author

Vizgaitis, Jay N., Andresen, Bjørn F., Marasco, Peter L., Sanghera, Jasbinder S., Snyder, Miguel P., Nag, Nagendra, Jha, Santosh, Sastri, Suri, Goldman, Lee M., McCarthy, Peter, Schmidt, Greg R., Bentley, Julie L., and Moore, Duncan T.

Published
2016
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50. Optical design study of a VIS-SWIR 3X zoom lens

Author

Betensky, Ellis, Yamanashi, Takanori, Berman, Rebecca, Corsetti, James A., Fang, Kejia, Fenning, Eryn, McCarthy, Peter, Schmidt, Greg R., Visconti, Anthony J., Williams, Daniel J. L., Yee, Anthony J., Zhao, Yang, Bentley, Julie, Moore, Duncan T., and Olson, Craig

Published
2015
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