Infrared spectra of organic monolayer films in a standing wave measured by photon-trap spectroscopy

Kazuhiro Egashira, Akira Terasaki, Tamotsu Kondow

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Photon-trap spectroscopy, a generalized scheme of cavity ringdown spectroscopy, is applied to measure an infrared spectrum of the C-H stretching vibration of alkylsiloxane monolayer films grafted on a silicon substrate. A continuous-wave laser beam is introduced into a high-finesse Fabry-Ṕrot cavity containing the substrate placed exactly normal to the light beam to minimize optical losses. The lifetime of the light trapped in the cavity is measured to detect optical absorption sensitively. The results show clear dependence of the absorbance on the location of the monolayers with respect to a standing wave formed in the cavity; the absorbance is practically zero when the monolayers on both the surfaces are adjusted at nodes, whereas it is maximized at antinodes. The present experiment is materialized on the basis of the principles established by our previous study [Terasaki, J. Opt. Soc. Am. B 22, 675 (2005)].

Original languageEnglish
Article number221102
JournalJournal of Chemical Physics
Issue number22
Publication statusPublished - 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Infrared spectra of organic monolayer films in a standing wave measured by photon-trap spectroscopy'. Together they form a unique fingerprint.

Cite this