Toward understanding the mechanism of nonlinear optical characteristics of PbTe thin film for nano-optical memory

Taek Sung Lee, Hyun Seok Lee, Byung Ki Cheong, Jeung Hyun Jeong, Dae Hwan Kang, Wu Zhe, Won Mok Kim, Donghwan Kim, Kyuman Cho

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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 μs) 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.

Original languageEnglish
Pages (from-to)293-297
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number1
Publication statusPublished - 2007 Jan

Keywords

  • Absorption Saturation
  • Band Filling
  • Nano-Optical Memory
  • Nonlinear Optical Property
  • PbTe
  • Super-Resolution (SR)
  • Thermoelectric

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Toward understanding the mechanism of nonlinear optical characteristics of PbTe thin film for nano-optical memory'. Together they form a unique fingerprint.

  • Cite this

    Lee, T. S., Lee, H. S., Cheong, B. K., Jeong, J. H., Kang, D. H., Zhe, W., Kim, W. M., Kim, D., & Cho, K. (2007). Toward understanding the mechanism of nonlinear optical characteristics of PbTe thin film for nano-optical memory. Journal of Nanoscience and Nanotechnology, 7(1), 293-297.