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Broadband Polarization-Independent Directional Control of Visible and Infrared Light
Abstract
Broadband polarization-independent directional control of light has long been a grand
challenge despite its immense potential in enhancing energy efficiency, improving performance of
optoelectronic devices and enabling privacy protection display. Existing devices for controlling
light direction suffer from inefficiency, bulkiness, and strict limitations in material composition.
We develop a highly miniaturized micro compound parabolic concentrator (MCPCs) array, which
overcomes these limitations and demonstrates broadband polarization-independent directional
control across the visible, near-infrared, and mid-infrared spectra.
In addition, our research showcases the wide-ranging applications enabled by advanced
directional control of light. Through the integration of MCPC arrays with thermal emitters, we
have created a bright directional emitter that deviates from the intrinsic isotropy of blackbody
emission, resulting in more efficient radiant thermal transfer. By integrating the MCPC arrays with
thermal radiation detectors, we effectively filter out environmental noise, thereby enhancing the
detector's signal-to-noise ratio. Furthermore, we demonstrate the ability to fabricate MCPC array
over large scale, broadening its potential applications. Privacy-protecting display is achieved and
radiative cooling decoupled with solar spectrum engineering is demonstrated
Citation
Fan, Ziwei (2023). Broadband Polarization-Independent Directional Control of Visible and Infrared Light. Doctoral dissertation, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /200085.