Stimulated resonance Raman scattering from epitaxially oriented crystals of biphenyl-capped thiophene

Yanagi, Hisao; Yoshiki, Atsutoshi
June 2004
Applied Physics Letters;6/7/2004, Vol. 84 Issue 23, p4783
Academic Journal
Spectrally narrowed light emission based on stimulated resonance Raman scattering has been observed for epitaxially grown needle crystals of a biphenyl-capped thiophene oligomer. Under optical pumping with a wavelength-tuned pulse laser, the crystals emitted a couple of sharp lines (full width at half maximum ∼0.3 nm) along the direction of the needle axis. In particular, the intense line with a Raman shift of 1435 cm-1 appeared at low excitation energy of a few μJ/pulse. This Raman line was assigned as the symmetric in-plane stretching mode of the molecule. The observed Raman-associated lasing suggests the presence of polaritonic interaction between the uniaxially ordered molecular excitons and emitted photons. © 2004 American Institute of Physics.


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