This inventor holds 2 USPTO granted patents and 1 published patent application. Top assignee: Other. Active years: 2020.
Company Filing History:
2 out of 834,453 Years Active: 2020
Title: Innovations by Yeong Hwan Ko
Introduction
Yeong Hwan Ko is an accomplished inventor based in Grand Prairie, TX (US). He has made significant contributions to the field of optical engineering, particularly in the development of advanced reflectors and filters. With a total of 2 patents, his work showcases innovative approaches to enhancing optical performance.
Latest Patents
Yeong Hwan Ko's latest patents include groundbreaking technologies such as polarization-independent wideband reflectors and methods for their manufacture. These reflectors utilize a serial arrangement of polarized subwavelength gratings to create unpolarized broadband reflectors. The designs feature partially-etched crystalline-silicon films on quartz substrates and amorphous silicon films on glass. The individual reflectors achieve extremely wide spectral reflection bands in one polarization, and when arranged sequentially with orthogonal periodicities, they produce an unpolarized spectral band that exceeds the individual polarized bands. The prototypes demonstrate zero-order reflectance exceeding 97% under unpolarized light incidence over a 500-nm-wide wavelength band, representing a 44% fractional band in the near-infrared spectral range.
Additionally, he has developed flat-top narrow bandpass filters based on cascaded resonant gratings. These filters are essential in various applications, including laser systems, imaging, telecommunications, and astronomy. By engaging guided-mode resonance effects alongside cavity-based Fabry-Pérot resonance, his approach flattens and steepens the pass band. Numerical examples illustrate the spectral characteristics of these filters, comparing single-layer 1D- and 2D-patterned resonant gratings with dual-grating cascade designs. The results show that these sparse structures can achieve comparable and improved outcomes compared to traditional multi-cavity thin-film filters.
Career Highlights
Throughout his career, Yeong Hwan Ko has demonstrated a commitment to advancing optical technologies. His innovative designs and methodologies have positioned him as a notable figure in the field.
Collaborations
He has collaborated with esteemed colleagues such as Robert Magnusson and Manoj Niraula, contributing to the development of cutting-edge optical solutions.
Conclusion
Yeong Hwan Ko's contributions to optical engineering through his patents reflect his innovative spirit and dedication to advancing technology. His work continues to influence the field and pave the way for future advancements in optical devices.