Lee, Taek Sung Lee, Hyun Seok Cheong, Byung-Ki Jeong, Jeung-Hyun Kang, Dae-Hwan Zhe, Wu Kim, Won Mok Kim, Donghwan Cho, Kyuman 2024-01-21T01:35:28Z 2024-01-21T01:35:28Z 2021-09-05 2007-01 1533-4880 https://pubs.kist.re.kr/handle/201004/134769 An experimental study is conducted toward understanding the mechanism of nonlinear optical properties of PbTe thin film that were demonstrated potentially usable for nano-optical memory based on super-resolution technology. By way of a real time optical-electrical characterization of a PbTe thin film device, it is found that absorption coefficient decreases with increasing laser power, accompanied by increase in carrier concentration. From z-scan measurements, nonlinear optical coefficient due to a long pulse (1 mu s) z-scan is found nearly 3 order of magnitude higher than the one due to a short pulse (30 ps) z-scan when input energy density is relatively comparable. Conceivably, these experimental findings call for a physical model that is able to account for the prevailing role of a thermal contribution within the framework of absorption saturation by band filling. We speculate that the absorption saturation might be enhanced dramatically by making various indirect interband transitions possible via participation of phonons in a photonic excitation process. English AMER SCIENTIFIC PUBLISHERS DATA STORAGE SUPERRESOLUTION SEMICONDUCTORS RESOLUTION Toward understanding the mechanism of nonlinear optical characteristics of PbTe thin film for nano-optical memory Article 10.1166/jnn.2007.027 1 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.7, no.1, pp.293 - 297 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 7 1 293 297 scie scopus 000243057900023 2-s2.0-34447296757 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article DATA STORAGE SUPERRESOLUTION SEMICONDUCTORS RESOLUTION nano-optical memory super-resolution (SR) PbTe nonlinear optical property absorption saturation band filling thermoelectric