Universality in unintentional laser resonators in $ \mathbf{\pi }$-conjugated polymer films

Randall C. Polson; Mikhail E. Raikh; Z.Valy Vardeny

doi:10.1016/S1631-0705(02)01336-1

Photonique moleculaire : matériaux, physique et composants/Molecular photonics: materials, physics and devices

Universality in unintentional laser resonators in

π

-conjugated polymer films

Randall C. Polson ¹ ; Mikhail E. Raikh ¹ ; Z.Valy Vardeny ¹

¹ Department of Physics, University of Utah, Salt Lake City, UT 84112, USA

Comptes Rendus. Physique, Volume 3 (2002) no. 4, pp. 509-521

Résumé

When films of π-conjugated polymers are optically excited above a certain threshold intensity, then the emission spectrum acquires a multimode finely structured shape, which depends on the position of the excitation spot. We demonstrate that the power Fourier transform (PFT) of the emission spectrum exhibits a certain peak-like structure, which also depends on the excitation spot. Our intriguing observation is that averaging the individual PFTs does not lead to a structureless curve, but rather yields a series of distinct transform peaks. This suggests universality, namely that the underlying random resonators that are responsible for the laser emission from the π-conjugated polymer film are almost identical. We argue that the reason for such an universality is the large size of a typical resonator, which we determined from the PFT, as compared to the emission wavelength, λ. This fact is, in turn, a consequence of the large light mean free path, $l^{*} ≃ 10 λ$ in the polymer film. This contrasts previous observations of random lasing in powders, where $l^{*} \sim λ$ . We develop a simple theory that explains the presence of peaks in the average PFT and predicts their shape. The results of the theory agree quantitatively with the data.

Accepté le : 2002-03-01
Publié le : 2002-01-01

DOI : 10.1016/S1631-0705(02)01336-1

Keywords: random lasing, Fourier transform, $ \mathbf{\pi }$-conjugated polymer

Affiliations des auteurs :

Randall C. Polson ¹ ; Mikhail E. Raikh ¹ ; Z.Valy Vardeny ¹

¹ Department of Physics, University of Utah, Salt Lake City, UT 84112, USA

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     title = {Universality in unintentional laser resonators in $ \mathbf{\pi }$-conjugated polymer films},
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Randall C. Polson; Mikhail E. Raikh; Z.Valy Vardeny. Universality in unintentional laser resonators in $ \mathbf{\pi }$-conjugated polymer films. Comptes Rendus. Physique, Volume 3 (2002) no. 4, pp. 509-521. doi: 10.1016/S1631-0705(02)01336-1

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