Abstract

The techniques of femtosecond laser spectroscopy have been applied to study the dynamics of carriers in the neighborhood of the mobility edge in hydrogenated amorphous silicon. Just after injection of a dense electron–hole plasma with pump photons above the mobility edge, the index of refraction decreases by as much as 2%, and the induced absorption is as large as 104 cm−1. Ten picoseconds later, intraband absorption becomes negligible and the temperature rise dominates the optical properties through the band-gap shrinkage, which produces an increase in the index of refraction and an increase in the interband absorption. The recovery takes place with two characteristic times, ~1 psec and ~10 psec. Possible interpretations of these times are presented.

© 1989 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Excitation spectroscopy of thin-film amorphous semiconductors using a free-electron laser

J. Ristein, B. Hooper, and P. C. Taylor
J. Opt. Soc. Am. B 6(5) 1003-1007 (1989)

Ultrafast nonlinear effects in hydrogenated amorphous silicon wire waveguide

Yuya Shoji, Takeshi Ogasawara, Toshihiro Kamei, Youichi Sakakibara, Satoshi Suda, Kenji Kintaka, Hitoshi Kawashima, Makoto Okano, Toshifumi Hasama, Hiroshi Ishikawa, and Masahiko Mori
Opt. Express 18(6) 5668-5673 (2010)

Free-carrier-induced third-order optical nonlinearities in semiconductors

S. Y. Auyang and P. A. Wolff
J. Opt. Soc. Am. B 6(4) 595-605 (1989)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (5)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription