Origin of nonlinear optical characteristics of crystalline Ge-Sb-Te thin films for possible superresolution effects

Hyun Seok Lee, Byung Ki Cheong, Taek Sung Lee, Jeung Hyun Jeong, Suyoun Lee, Won Mok Kim, Donghwan Kim

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

An experiment was conducted to investigate the origin of the nonlinear optical characteristics of crystalline Ge2Sb2Te 5 and Ge-doped SbTe thin films which have been demonstrated to have the capability of a superresolution readout. By means of the real-time measurement of the electrical resistance combined with concurrent optical reflectance/transmittance measurement during pulsed laser irradiation of varying power, it was found that the absorption coefficients of these films decrease with increasing laser power, accompanied most probably by an increase in the carrier concentration. This finding may be understood in light of the saturable absorption due to band filling by thermally assisted photoexcited carriers. This has been previously proposed as an important cause of the superresolution effect of PbTe, which belongs to the chalcogenide degenerate semiconductors such as the GeSbTe materials under study.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume46
Issue number12-16
DOIs
Publication statusPublished - 2007 Apr 13

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Acoustic impedance
Laser beam effects
Time measurement
Pulsed lasers
Carrier concentration
Semiconductor materials
Crystalline materials
Thin films
Lasers
thin films
electrical resistance
readout
pulsed lasers
transmittance
absorptivity
Experiments
time measurement
reflectance
irradiation
causes

Keywords

  • Free carrier
  • Ge-doped SbTe
  • GeSb Te
  • Nonlinear optical effect
  • Optical data storage
  • PbTe
  • Saturable absorption
  • Superresolution (SR)

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Origin of nonlinear optical characteristics of crystalline Ge-Sb-Te thin films for possible superresolution effects. / Lee, Hyun Seok; Cheong, Byung Ki; Lee, Taek Sung; Jeong, Jeung Hyun; Lee, Suyoun; Kim, Won Mok; Kim, Donghwan.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 46, No. 12-16, 13.04.2007.

Research output: Contribution to journalArticle

Lee, Hyun Seok ; Cheong, Byung Ki ; Lee, Taek Sung ; Jeong, Jeung Hyun ; Lee, Suyoun ; Kim, Won Mok ; Kim, Donghwan. / Origin of nonlinear optical characteristics of crystalline Ge-Sb-Te thin films for possible superresolution effects. In: Japanese Journal of Applied Physics, Part 2: Letters. 2007 ; Vol. 46, No. 12-16.
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