Nathan Tessema Ersumo

EECS Department, University of California, Berkeley

Technical Report No. UCB/EECS-2020-180

September 16, 2020

http://www2.eecs.berkeley.edu/Pubs/TechRpts/2020/EECS-2020-180.pdf

High-speed primitive optical modulation is widely employed across applications in microscopy, material processing, adaptive optics and augmented/virtual reality. Despite this ubiquity, the embodiments of specific optical modulation tools may vary considerably as a result of the specific performance needs of each application. We present here a consolidated modular framework for the systemic design of high-speed (~10 kHz) array-based optical modulation devices requiring limited degrees of freedom (~10-100). The proposed framework combines a semi-custom commercial fabrication process with a comprehensive simulation pipeline in order to optimally reconfigure pixel wiring schemes for the efficient allocation of available degrees of freedom. By decoupling the pixel-level building blocks determining transduction characteristics from the array-scale partitioning geometry determining overall optical functionality, the framework is able to produce tailored array-scale designs that are both robust to process variations and easily reconfigurable for adaptation to alternative specifications. As a demonstration of this framework, phase-shifting piston-motion parallel-plate capacitive micromirrors were designed and fabricated in small array formats for preliminary assessment and characterization under MEMSCAP’s standard PolyMUMPs process. Once a suitable micromirror structure was identified, an axial focusing array with a simulated optical power range of ±2.89 diopters was subsequently designed via an iterative ring partitioning process and a Monte Carlo-based simulation pipeline that accounted for experimentally measured spatial variations in pixel performance.

Advisors: Rikky Muller

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BibTeX citation:

@mastersthesis{Ersumo:EECS-2020-180,
    Author= {Ersumo, Nathan Tessema},
    Title= {A Modular Design Framework for the Systematic Development of Primitive, Application-Specific Optical Modulation Tools},
    School= {EECS Department, University of California, Berkeley},
    Year= {2020},
    Month= {Sep},
    Url= {http://www2.eecs.berkeley.edu/Pubs/TechRpts/2020/EECS-2020-180.html},
    Number= {UCB/EECS-2020-180},
    Abstract= {High-speed primitive optical modulation is widely employed across applications in microscopy, material processing, adaptive optics and augmented/virtual reality. Despite this ubiquity, the embodiments of specific optical modulation tools may vary considerably as a result of the specific performance needs of each application. We present here a consolidated modular framework for the systemic design of high-speed (~10 kHz) array-based optical modulation devices requiring limited degrees of freedom (~10-100). The proposed framework combines a semi-custom commercial fabrication process with a comprehensive simulation pipeline in order to optimally reconfigure pixel wiring schemes for the efficient allocation of available degrees of freedom. By decoupling the pixel-level building blocks determining transduction characteristics from the array-scale partitioning geometry determining overall optical functionality, the framework is able to produce tailored array-scale designs that are both robust to process variations and easily reconfigurable for adaptation to alternative specifications. As a demonstration of this framework, phase-shifting piston-motion parallel-plate capacitive micromirrors were designed and fabricated in small array formats for preliminary assessment and characterization under MEMSCAP’s standard PolyMUMPs process. Once a suitable micromirror structure was identified, an axial focusing array with a simulated optical power range of ±2.89 diopters was subsequently designed via an iterative ring partitioning process and a Monte Carlo-based simulation pipeline that accounted for experimentally measured spatial variations in pixel performance.},
}

EndNote citation:

%0 Thesis
%A Ersumo, Nathan Tessema 
%T A Modular Design Framework for the Systematic Development of Primitive, Application-Specific Optical Modulation Tools
%I EECS Department, University of California, Berkeley
%D 2020
%8 September 16
%@ UCB/EECS-2020-180
%U http://www2.eecs.berkeley.edu/Pubs/TechRpts/2020/EECS-2020-180.html
%F Ersumo:EECS-2020-180