title: Highly photoresponsive and wavelength-selective circularly-polarized-light detector based on metal-oxides hetero-chiral thin film.
abstract: A highly efficient circularly-polarized-light detector with excellent wavelength selectivity is demonstrated with an elegant and simple microelectronics-compatible way. The circularly-polarized-light detector based on a proper combination of the geometry-controlled TiO2-SnO2 hetero-chiral thin film as an effective chiroptical filter and the Si active layer shows excellent chiroptical response with external quantum efficiency as high as 30% and high helicity selectivity of ~15.8% in an intended wavelength range. Furthermore, we demonstrated the ability of manipulating both bandwidth and responsivity of the detector simultaneously in whole visible wavelength range by a precise control over the geometry and materials constituting hetero-chiral thin film. The high efficiency, wavelength selectivity and compatibility with conventional microelectronics processes enabled by the proposed device can result in remarkable developments in highly integrated photonic platforms utilizing chiroptical responses.
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea.
authors.forename: Seung Hee
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany.
authors.forename: Dhruv Pratap
authors.initials: DP
authors.lastname: Singh
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea.
authors.forename: Ji Ho
authors.initials: JH
authors.lastname: Sung
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea.
authors.forename: Moon-Ho
authors.initials: MH
authors.lastname: Jo
authors.affiliation: School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul, 156-756, Republic of Korea.|Department of Materials Science and Engineering, Research Institute for Advanced Materials, Seoul National University, Seoul, 151-744, Republic of Korea.
authors.forename: Ki Chang
authors.initials: KC
authors.lastname: Kwon
authors.affiliation: School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul, 156-756, Republic of Korea.
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Research Institute for Advanced Materials, Seoul National University, Seoul, 151-744, Republic of Korea.
authors.forename: Ho Won
authors.initials: HW
authors.lastname: Jang
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 790-784, Republic of Korea.
authors.forename: Jong Kyu
authors.initials: JK
authors.lastname: Kim