Enhanced lasing behavior enabled by guided-mode resonance structure embedded with double waveguide layers

Applied Optics
Kangni WangKaige Gao

Abstract

By doping a laser dye into two polyurethane layers in a guided-mode resonance (GMR) structure, we observed that the lasing emission can be enhanced by approximately fivefold. The structure comprises, from top to bottom, a grating layer, four alternating layers of polyurethane and Ta2O5, and a bottom substrate. Two different GMR wavelengths can be generated because of the two films of Ta2O5 serving as waveguide layers. The enhancement of the lasing emission is achieved by matching both the absorption and emission wavelength of the laser dye with the two GMR wavelengths. When the absorption wavelength matches the GMR wavelength, the formation of high intensity near the polyurethane layer serves to efficiently excite the laser dye. Additionally, as the emission wavelength overlaps with the GMR wavelength, the extraction of lasing intensity can be further increased in the preferred directions owing to the high reflection efficiency and directivity of the GMR. Moreover, we found that the linewidth is reduced to approximately 1.06 nm, and the estimated threshold is approximately 0.92mJ/cm2 when both excitation and extraction resonances occur in the waveguide structure.

References

Feb 19, 2005·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Akio MizutaniKoichi Iwata
Sep 20, 2006·Applied Optics·Dennis W Dobbs, Brian T Cunningham
Jul 26, 2008·Nature Nanotechnology·Nikhil GaneshBrian T Cunningham
May 10, 1993·Applied Optics·S S Wang, R Magnusson
Jun 19, 2013·Nature Nanotechnology·Wei ZhouTeri W Odom

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