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Photoinduced polarization inversion in a polymeric molecule

Sun¹, Fu, Yonemitsu

¹Center for Theoretical Physics and Department of Physics, Fudan University, Shanghai 200433, China and National Laboratory of Infrared Physics, Academia Sinica, Shanghai 200083, China.

Physical Review Letters

|October 6, 2000

Summary

Researchers discovered a new photoinduced phenomenon in polymeric molecules. This ultrafast process reverses a molecule's electric dipole in just 200 femtoseconds upon absorbing a single photon.

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Area of Science:

Polymer science
Photophysics
Molecular electronics

Background:

Understanding molecular behavior under light is crucial for advanced materials.
Bipolarons in polymers can influence electronic properties.

Purpose of the Study:

To investigate novel photoinduced phenomena in polymeric molecules.
To characterize the dynamics of photoinduced polarization inversion at the single-molecule level.

Main Methods:

Spectroscopic analysis of single polymeric molecules.
Ultrafast laser excitation and probing techniques.

Main Results:

A new photoinduced phenomenon was observed where a single photon reverses the electric dipole of a bipolaron in a polymeric molecule.

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This polarization inversion is an ultrafast process with a measured relaxation time of 200 femtoseconds.

Conclusions:

The study reveals an unprecedented ultrafast photoinduced polarization inversion in single molecules.
This finding opens new avenues for molecular switches and ultrafast optical devices.