
Steven Yee
Ph.D. Student in Electrical Engineering, admitted Autumn 2021
All Publications
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Y-Z cut lithium niobate longitudinal piezoelectric resonant photoelastic modulator
OPTICS EXPRESS
2022; 30 (26): 47103-47114
Abstract
The capability to modulate the intensity of an optical beam has scientific and practical significance. In this work, we demonstrate Y-Z cut lithium niobate acousto-optic modulators with record-high modulation efficiency, requiring only 1.5 W/cm2 for 100% modulation at 7 MHz. These modulators use a simple fabrication process; coating the top and bottom surfaces of a thin lithium niobate wafer with transparent electrodes. The fundamental shear acoustic mode of the wafer is excited through the transparent electrodes by applying voltage with frequency corresponding to the resonant frequency of this mode, confining an acoustic standing wave to the electrode region. Polarization of light propagating through this region is modulated at the applied frequency. Polarization modulation is converted to intensity modulation by placing the modulator between polarizers. To showcase an important application space for this modulator, we integrate it with a standard image sensor and demonstrate 4 megapixel time-of-flight imaging.
View details for DOI 10.1364/OE.476970
View details for Web of Science ID 000914755600002
View details for PubMedID 36558647
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Self-Powered High Energy Laser Detectors via Thermoelectric Generators
SPIE-INT SOC OPTICAL ENGINEERING. 2021
View details for DOI 10.1117/12.2587812
View details for Web of Science ID 000696727700006
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Photothermal actuation of levitated pyrolytic graphite revised
APL Materials
2021; 9
View details for DOI 10.1063/5.0061390
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High-energy laser detection through thermoelectric generators
OPTICAL ENGINEERING
2020; 59 (11)
View details for DOI 10.1117/1.OE.59.11.117105
View details for Web of Science ID 000597284800035
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Autonomous Microrobotic Manipulation Using Visual Servo Control
MICROMACHINES
2020; 11 (2)
Abstract
This describes the application of a visual servo control method to the microrobotic manipulation of polymer beads on a two-dimensional fluid interface. A microrobot, actuated through magnetic fields, is utilized to manipulate a non-magnetic polymer bead into a desired position. The controller utilizes multiple modes of robot actuation to address the different stages of the task. A filtering strategy employed in separation mode allows the robot to spiral from the manipuland in a fashion that promotes the manipulation positioning objective. Experiments demonstrate that our multiphase controller can be used to direct a microrobot to position a manipuland to within an average positional error of approximately 8 pixels (64 µm) over numerous trials.
View details for DOI 10.3390/mi11020132
View details for Web of Science ID 000520181500021
View details for PubMedID 31991607
View details for PubMedCentralID PMC7074596
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Optical control and manipulation of diamagnetically levitated pyrolytic graphite
AIP ADVANCES
2019; 9 (12)
View details for DOI 10.1063/1.5129886
View details for Web of Science ID 000505567500001
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Optomechanical Actuation of Diamagnetically Levitated Pyrolytic Graphite
IEEE TRANSACTIONS ON MAGNETICS
2019; 55 (7)
View details for DOI 10.1109/TMAG.2019.2892332
View details for Web of Science ID 000472626900001
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A Miniature Reconfigurable Circularly Polarized Antenna Using Liquid Microswitches
IEEE. 2015
View details for Web of Science ID 000380567600022
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Microstrip Antenna Tuning using Variable Reactive Microelectromechanical Systems
IEEE. 2011: 1828-1833
View details for Web of Science ID 000302341400281