Spontaneous emission and dephasing in front of a mirror: measurement of the ultrafast dynamics of nile blue in a polymer

✍ Scribed by Karel E. Drabe; Gerard Cnossen; Douwe A. Wiersma

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 438 KB
• Volume: 169
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(90)87069-4

✦ Synopsis

We show that the spontaneous emission spectrum of a thin sample in front ofa mirror exhibits Wiener-type fringes that contain information on the dephasing dynamics of the excited molecules. In order to probe these dynamics, the molecules must be excited with a short optical pulse or with a light field that has a correlation time shorter than the dephasing time constant T,. The technique is used to study the ultrafast dephasing of nile blue in a polymer matrix at room temperature. A homogeneous dephasing time constant T, of 1 OOi 10 fs is obtained.