Lasing in -Conjugated Systems Z. V. Vardeny, M. E. Raikh and M. DeLong

DMR 0202790; The University of Utah

Laser action in -conjugated organic systems has been studied both experimentally and theoretically. It has been demonstrated that coherent superfluorescence is the underlying laser action in distyryl-benzene (DSB) single crystals. Lasing based on cavity feedback has been also demonstrated in DSB crystals with unintentionally formed cavities.

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Laser action emission in DSB crystal (shown in inset) at = 450 nm, which shows coherent

oscillation due to superfluorescence.

Excitation laser pulse

SF emission

Education:This work has involved three graduate students (C. X. Sheng, M. Tong and A. Tulek), an undergraduate student (B. Burns), and a postdoc (R. Polson). We have also collaborated with two visiting professors from the Technion: Drs. B. Shapiro and E. Ehrenfreund.We also have an effort in SAM growth of -conjugated molecules, directed by a postdoc, Dr V. Burtman and a grad student, A. Ndobe. A new graduate course on the optical properties of -conjugated systems has been developed and taught for a class of about 12 students.

Outreach:The electronic and optical characteristics of -conjugated semiconductors have been discussed in various G- and UG classes; as well as HS students that visited the department, for demonstrating the unique properties of molecular electronics and organic semiconductors .

The PI, Z. V. Vardeny demonstrates the unique properties of DSB crystals to students at the University of Utah in Salt Lake City.

Lasing in -Conjugated Systems Z. V. Vardeny, M. E. Raikh and M. DeLong

DMR 0202790; The University of Utah