Dr. Bill J. Cassarly Profile

Dr. Bill J. Cassarly

Synopsys Scientist at Synopsys Inc

SPIE Involvement:

Fellow status | Conference Program Committee | Author | Instructor

Publications (41)

PROCEEDINGS ARTICLE | November 27, 2017

Using pinhole images to understand nonimaging optics

Proc. SPIE. 10590, International Optical Design Conference 2017

KEYWORDS: Optical design, Cameras, Freeform optics, Nonimaging optics, Illumination engineering, Illumination software

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PROCEEDINGS ARTICLE | November 27, 2017

IODC 2017 illumination design problem: the centennial illuminator

Proc. SPIE. 10590, International Optical Design Conference 2017

KEYWORDS: Optical design, Computer aided design, Optical design software, Illumination engineering, Illumination software

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PROCEEDINGS ARTICLE | November 27, 2017

Parametric model of volumetric scattering

Proc. SPIE. 10590, International Optical Design Conference 2017

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SPIE Journal Paper | January 12, 2016

Accounting for coherent effects in the ray-tracing of light-emitting diodes with interface gratings via mixed-level simulation

Bahl, Mayank , Heller, Evan , Cassarly, William , Scarmozzino, Robert

OE Vol. 55 Issue 01

KEYWORDS: Light emitting diodes, Reflectors, Monte Carlo methods, Finite-difference time-domain method, Collimation, Solids, Interfaces, Computer simulations, Optical engineering, Scattering

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PROCEEDINGS ARTICLE | August 25, 2015

Illumination system design with multi-step optimization

Proc. SPIE. 9572, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XII

KEYWORDS: Fluctuations and noise, Waveguides, Glasses, Ions, Receivers, Solids, Optimization (mathematics), Spherical lenses, Light, Fiber optic illuminators

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SPIE Journal Paper | April 21, 2015

Mixed-level optical simulations of light-emitting diodes based on a combination of rigorous electromagnetic solvers and Monte Carlo ray-tracing methods

Bahl, Mayank , Zhou, Guirong , Heller, Evan , Cassarly, William , Jiang, Mingming , Scarmozzino, Robert , Gregory, G. Groot , Herrmann, Daniel

OE Vol. 54 Issue 04

KEYWORDS: Light emitting diodes, Monte Carlo methods, Glasses, Finite-difference time-domain method, Interfaces, Polarization, Organic light emitting diodes, Eye, Scattering, Optical simulations

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PROCEEDINGS ARTICLE | March 10, 2015

Modeling scattering in turbid media using the Gegenbauer phase function

Proc. SPIE. 9333, Biomedical Applications of Light Scattering IX

KEYWORDS: Refractive index, Tissues, Scattering, Particles, Light scattering, Monte Carlo methods, Fractal analysis, Mie scattering, Tissue optics, Anisotropy

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PROCEEDINGS ARTICLE | December 17, 2014

IODC 2014 Illumination design problem: the Cinderella Lamp

Proc. SPIE. 9293, International Optical Design Conference 2014

KEYWORDS: Mirrors, Optical design, Polishing, Light emitting diodes, Glasses, Lamps, Lens design, Surface finishing, Fiber optic illuminators, Absorption

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PROCEEDINGS ARTICLE | September 18, 2014

Optical simulations of organic light-emitting diodes through a combination of rigorous electromagnetic solvers and Monte Carlo ray-tracing methods

Proc. SPIE. 9190, Thirteenth International Conference on Solid State Lighting

KEYWORDS: Eye, Finite-difference time-domain method, Scattering, Organic light emitting diodes, Glasses, Interfaces, Computer simulations, Monte Carlo methods, Geometrical optics, Electromagnetism

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SPIE Journal Paper | November 21, 2013

Supporting conic design methods and conic intersection properties

Canavesi, Cristina , Cassarly, William , Rolland, Jannick

OE Vol. 53 Issue 03

KEYWORDS: Reflectors, Ray tracing, Monte Carlo methods, Computer programming, Detection and tracking algorithms, Reflector design, Optical engineering, Light, Inverse optics, Inverse problems

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PROCEEDINGS ARTICLE | September 18, 2013

Supporting conic design methods and conic intersection properties

Proc. SPIE. 8834, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration X

KEYWORDS: Reflectors, Detection and tracking algorithms, Silicon, Computer programming, Monte Carlo methods, Inverse problems, Ray tracing, Reflector design, Nonimaging optics, Light

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PROCEEDINGS ARTICLE | October 11, 2012

Implementation of the linear programming algorithm for freeform reflector design

Proc. SPIE. 8485, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX

KEYWORDS: Reflectors, Optical design, 3D acquisition, Detection and tracking algorithms, Silicon, Computer programming, Ray tracing, Chemical elements, Reflector design, Nonimaging optics

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PROCEEDINGS ARTICLE | September 21, 2011

Using the on-axis BSDF at a dielectric surface to model the BSDF at off-axis angles

Proc. SPIE. 8170, Illumination Optics II

KEYWORDS: Statistical analysis, Dielectrics, Reflectivity, 3D modeling, Monte Carlo methods, Bidirectional reflectance transmission function, Ray tracing, Diffusers, Transmittance, Diffraction gratings

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PROCEEDINGS ARTICLE | September 8, 2011

Illumination devices for uniform delivery of light to the oral cavity for photodynamic therapy

Proc. SPIE. 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII

KEYWORDS: Reflectors, Oncology, Photodynamic therapy, Cancer, Tissues, Error analysis, Reflectivity, Ray tracing, Optics manufacturing, Prototyping

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PROCEEDINGS ARTICLE | September 9, 2010

Iterative reflector design using a cumulative flux compensation approach

Proc. SPIE. 7652, International Optical Design Conference 2010

KEYWORDS: Reflectors, Light emitting diodes, Detection and tracking algorithms, Computer simulations, Monte Carlo methods, Ray tracing, Virtual reality, Optimization (mathematics), Reflector design, Prototyping

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PROCEEDINGS ARTICLE | September 9, 2010

Freeform reflector design using integrable maps

Proc. SPIE. 7652, International Optical Design Conference 2010

KEYWORDS: Reflectors, Light sources, Detection and tracking algorithms, Manufacturing, Photonics, Light sources and illumination, Freeform optics, Spherical lenses, Reflector design, Light

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PROCEEDINGS ARTICLE | August 21, 2009

Designing freeform reflectors for extended sources

Proc. SPIE. 7423, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VI

KEYWORDS: Reflectors, Detection and tracking algorithms, Scattering, Light scattering, Fourier transforms, Solids, Computer aided design, Algorithm development, Reflector design, Light

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PROCEEDINGS ARTICLE | September 24, 2008

Optimization of single reflectors for extended sources

Proc. SPIE. 7103, Illumination Optics

KEYWORDS: Reflectors, Detection and tracking algorithms, Reflectivity, Monte Carlo methods, Near field, Ray tracing, Headlamps, Optimization (mathematics), Reflector design, Light

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PROCEEDINGS ARTICLE | September 23, 2008

Recent advances in mixing rods

Proc. SPIE. 7103, Illumination Optics

KEYWORDS: Mirrors, Eye, Light emitting diodes, Computer simulations, Spatial light modulators, Monte Carlo methods, Solids, Diffusers, Astatine, RGB color model

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PROCEEDINGS ARTICLE | November 28, 2007

Backlight pattern optimization

Proc. SPIE. 6834, Optical Design and Testing III

KEYWORDS: Light emitting diodes, Waveguides, Reflectivity, Control systems, Monte Carlo methods, LCDs, Diffusers, LED backlight, Optimization (mathematics), Prototyping

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PROCEEDINGS ARTICLE | September 18, 2007

Illumination merit functions

Proc. SPIE. 6670, Nonimaging Optics and Efficient Illumination Systems IV

KEYWORDS: Reflectors, Light emitting diodes, Fluctuations and noise, Receivers, Monte Carlo methods, Collimators, Collimation, Ray tracing, Optimization (mathematics), Systems modeling

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PROCEEDINGS ARTICLE | July 18, 2006

Optimizing density patterns to achieve desired light extraction for displays

Proc. SPIE. 6342, International Optical Design Conference 2006

KEYWORDS: Reflectors, Light emitting diodes, Detection and tracking algorithms, Waveguides, Photography, Control systems, Diffusers, Raster graphics, Prototyping, Light

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PROCEEDINGS ARTICLE | July 18, 2006

Non-rotationally symmetric mixing rods

Proc. SPIE. 6342, International Optical Design Conference 2006

KEYWORDS: Reflectors, Mirrors, Optical design, Light emitting diodes, Reflection, Dielectrics, Ray tracing, Solids, Projection systems, RGB color model

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PROCEEDINGS ARTICLE | August 20, 2005

Optimizing angle-to-area-converting, light-piping systems using surface features

Proc. SPIE. 5942, Nonimaging Optics and Efficient Illumination Systems II

KEYWORDS: Superposition, Energy efficiency, Refractive index, Polymethylmethacrylate, Energy transfer, Dielectrics, Receivers, Autoregressive models, Systems modeling, Light

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PROCEEDINGS ARTICLE | February 10, 2005

Noise tolerant illumination optimization applied to display devices

Proc. SPIE. 5638, Optical Design and Testing II

KEYWORDS: Reflectors, Prisms, Light emitting diodes, Waveguides, Lamps, Monte Carlo methods, 3D displays, LED displays, Optimization (mathematics), Prototyping

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PROCEEDINGS ARTICLE | October 22, 2004

Optimization for efficient angle-to-area conversion in illumination systems

Proc. SPIE. 5524, Novel Optical Systems Design and Optimization VII

KEYWORDS: Energy efficiency, Refractive index, Detection and tracking algorithms, Reflection, Energy transfer, Dielectrics, Reflectivity, Refraction, Compound parabolic concentrators, Neodymium

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PROCEEDINGS ARTICLE | September 1, 2004

Optimization for illumination systems: the next level of design

Proc. SPIE. 5456, Photon Management

KEYWORDS: Reflectors, Solar concentrators, Reflectivity, Computing systems, Monte Carlo methods, Ray tracing, Aspheric lenses, Compound parabolic concentrators, Raster graphics, Optimization (mathematics)

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PROCEEDINGS ARTICLE | January 8, 2004

Taming light using nonimaging optics

Proc. SPIE. 5185, Nonimaging Optics: Maximum Efficiency Light Transfer VII

KEYWORDS: Lithography, Optical design, Displays, Solar concentrators, Lithographic illumination, Fiber optics, Imaging systems, Solids, Nonimaging optics, Fiber optic illuminators

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PROCEEDINGS ARTICLE | November 12, 2003

The art of making efficient illuminator design fun

Proc. SPIE. 5186, Design of Efficient Illumination Systems

KEYWORDS: Human-machine interfaces, Light sources, Light emitting diodes, Lamps, Computing systems, Computer simulations, Monte Carlo methods, Ray tracing, Prototyping, Fiber optic illuminators

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PROCEEDINGS ARTICLE | December 23, 2002

Illumination optimization: The revolution has begun

Proc. SPIE. 4832, International Optical Design Conference 2002

KEYWORDS: Reflectors, Detection and tracking algorithms, Imaging systems, Computing systems, Monte Carlo methods, Ray tracing, Algorithm development, Optimization (mathematics), Systems modeling, Illumination software

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PROCEEDINGS ARTICLE | September 4, 2002

Error estimation and smoothing of 2D illumination and chromaticity distributions

Proc. SPIE. 4769, Optical Design and Analysis Software II

KEYWORDS: Gold, Roads, Image segmentation, Error analysis, Copper, Silver, Monte Carlo methods, Ray tracing, Nonlinear filtering, RGB color model

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PROCEEDINGS ARTICLE | August 16, 2002

Accurate illumination system predictions using measured spatial luminance distributions

Proc. SPIE. 4775, Modeling and Characterization of Light Sources

KEYWORDS: Optical components, Reflectors, Light sources, Imaging systems, Cameras, Glasses, Lamps, Monte Carlo methods, Integrating spheres, Geometrical optics

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SPIE Journal Paper | May 1, 2001

Analysis of single lens arrays using convolution

Riser, Andrew , Cassarly, William

OE Vol. 40 Issue 05

KEYWORDS: Convolution, Reflectors, Monte Carlo methods, Lamps, Superposition, Optical engineering, Wavefronts, Ray tracing, Collimation, Spherical lenses

SPIE Journal Paper | July 1, 2000

Automated design of a uniform distribution using faceted reflectors

Cassarly, William , David, Stuart , Jenkins, David , Riser, Andrew , Davenport, Thomas

OE Vol. 39 Issue 07

KEYWORDS: Reflectors, Reflector design, Image segmentation, Detection and tracking algorithms, Monte Carlo methods, Superposition, Convolution, Solids, Optical engineering, Light sources and illumination

PROCEEDINGS ARTICLE | September 21, 1998

Faceted reflector design for uniform illumination

Proc. SPIE. 3482, International Optical Design Conference 1998

KEYWORDS: Superposition, Reflectors, Monochromatic aberrations, Glasses, Lamps, Receivers, Monte Carlo methods, Reflector design, Performance modeling, Systems modeling

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PROCEEDINGS ARTICLE | June 1, 1994

Phase locking of a two-dimensional semiconductor laser array in an external Talbot cavity

Proc. SPIE. 2148, Laser Diode Technology and Applications VI

KEYWORDS: Diffraction, Mirrors, Phase contrast, Imaging systems, Mode locking, Control systems, Semiconductor lasers, Liquid crystals, Phased arrays, Phase measurement

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PROCEEDINGS ARTICLE | June 16, 1993

Phased 2D semiconductor laser array for high coherent output power

Proc. SPIE. 1850, Laser Diode Technology and Applications V

KEYWORDS: Diffraction, Mirrors, Continuous wave operation, Waveguides, Control systems, Semiconductor lasers, Liquid crystals, Sensing systems, Phased arrays, Laser damage threshold

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PROCEEDINGS ARTICLE | June 26, 1992

Automated two-dimensional phase sensing and control using phase-contrast imaging

Proc. SPIE. 1634, Laser Diode Technology and Applications IV

KEYWORDS: Fourier transforms, Wavefronts, Phase shift keying, Control systems, Semiconductor lasers, Near field, Liquid crystals, Sensing systems, Phase measurement, Technologies and applications

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PROCEEDINGS ARTICLE | June 26, 1992

Semiconductor laser array in an external Talbot cavity

Proc. SPIE. 1634, Laser Diode Technology and Applications IV

KEYWORDS: Diffraction, Mirrors, Continuous wave operation, Waveguides, Laser applications, Control systems, Semiconductor lasers, Liquid crystals, Sensing systems, Technologies and applications

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PROCEEDINGS ARTICLE | June 1, 1991

Low-insertion-loss, high-precision liquid crystal optical phased array

Proc. SPIE. 1417, Free-Space Laser Communication Technologies III

KEYWORDS: Diffraction, Telescopes, Etching, Electrodes, Laser applications, Wavefronts, Phase shift keying, Liquid crystals, Free space optical communications, Phase shifts

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PROCEEDINGS ARTICLE | May 1, 1990

Continuous wide-angle beam steering using translation of binary microlens arrays and a liquid-crystal phased array

Proc. SPIE. 1211, Computer and Optically Formed Holographic Optics

KEYWORDS: Telescopes, Beam steering, Holography, Microlens array, Space telescopes, Microlens, Liquid crystals, Phased arrays, Binary data, Phased array optics

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Showing 5 of 41 publications

Conference Committee Involvement (36)

Optical Modeling and Performance Predictions X

22 August 2018 | San Diego, California, United States

Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XV

19 August 2018 | San Diego, California, United States

Illumination Optics V

14 May 2018 | Frankfurt, Germany

Optical Modeling and Performance Predictions IX

8 August 2017 | San Diego, California, United States

Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV

6 August 2017 | San Diego, California, United States

Showing 5 of 36 published special sections

Course Instructor

SC011: Design of Efficient Illumination Systems

Illumination systems are included in fiber illuminators, projectors, and lithography systems. The design of an illumination system requires balancing uniformity, maximizing the collection efficiency from the source, and minimizing the size of the optical package. These choices are examined for systems using lightpipes, lens arrays, faceted optics, tailored edge rays designs, and integrating spheres through a combination of computer simulations, hardware demonstrations and discussions.

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SC345: Light Source Modeling

The increasing power of illumination software has accentuated the demand for creating accurate source models. This course is an overview of source modeling techniques ranging from apodization of point sources to construction of sources using extended emitters to apodization using multiple CCD camera images. Emphasis is placed on incoherent sources including incandescent, halogen, fluorescent, high intensity discharge, and light emitting diodes. The use of optimization to fine tune source models is shown.

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