Continuously Tunable and Bandwidth Variable Optical Notch/Band-Pass Filters Over 500 nm Spectral Range Using Cholesteric Liquid Crystals

by Mi-Yun Jeong, Keumcheol Kwak
Published 2019-01-01

Continuously Tunable Optical Notch Filter With Functions of a Mirror and a Beam Splitter

by Mi-Yun Jeong, Keumcheol Kwak
Published 2019-01-01

Maskless Fabrication of Film-Patterned-Retarder (FPR) Using Wedged Liquid Crystal Cell

by Doyeon Lee, Keumcheol Kwak, Chul Gyu Jhun, Hyun Seok Choi, Jang-kun Song
Published 2019-01-01

External pressure induced liquid crystal defects for optical vortex generation

by L. K. Migara, Heesu Lee, Cheon-Myeong Lee, Keumcheol Kwak, Doyeon Lee, Jang-Kun Song
Published 2018-06-01