Journal
NANO LETTERS
Volume 23, Issue 14, Pages 6512-6519Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.3c01463
Keywords
fluorescent & pi;-conjugated polymer microspheres; whispering gallery modes; surface plasmon resonance; frustrated total internal reflection; Otto configuration
Ask authors/readers for more resources
This study investigated the influence of metallic and dielectric conducting substrates, gold and indium tin oxide (ITO)-coated glass, on the whispering gallery modes (WGMs) of semiconductor p-conjugated polymer microspheres. Hyperspectral mapping was performed to obtain the excitation-position-dependent emission spectra of the microspheres. Quenching of WGMs sensitive to mode polarization dependent on the substrates was observed and explained. The study provides insights into the damping mechanisms of WGMs in microspheres on metallic and dielectric substrates.
In this work, the impact of metallic and dielectric conducting substrates, gold and indium tin oxide (ITO)-coated glass, on the whispering gallery modes (WGMs) of semiconductor p-conjugated polymer microspheres is investigated. Hyperspectral mapping was performed to obtain the excitation-position-dependent emission spectra of the microspheres. Substrate-dependent quenching of WGMs sensitive to mode polarization was observed and explained. On a glass substrate, both transverse-electric (TE) and transverse-magnetic (TM) WGMs are quenched due to frustrated total internal reflection. On a gold substrate, however, only the TM WGMs are allowed in symmetry to leak into surface plasmons. An atomically flat gold substrate with subwavelength slits was used to experimentally verify the leakage of WGMs into the surface plasmon polaritons (SPPs). This work provides insight into the damping mechanisms of WGMs in microspheres on metallic and dielectric substrates.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available