Optics of an individual organic molecular mesowire waveguide: directional light emission and anomalous refractive index

We report on experimental investigations performed on an isolated organic mesowire waveguide resting on a glass substrate. The waveguide was made of diaminoanthraquinone (DAAQ) molecular aggregates. First, we show directional emission of light from distal ends of the DAAQ waveguide. For a given meso...

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Bibliographic Details
Published in:Journal of optics (2010) 2016-06, Vol.18 (6), p.65002-65012
Main Authors: Tripathi, Ravi P N, Dasgupta, Arindam, Chikkaraddy, Rohit, Patra, Partha Pratim, Vasista, Adarsh B, Kumar, G V Pavan
Format: Article
Language:English
Subjects:
Angles (geometry)
Emission
Fourier microscopy
Light emission
optical antenna
organic photonics
Photoluminescence
Refractive index
Refractivity
Three dimensional
Waveguides
waveguiding
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Summary:We report on experimental investigations performed on an isolated organic mesowire waveguide resting on a glass substrate. The waveguide was made of diaminoanthraquinone (DAAQ) molecular aggregates. First, we show directional emission of light from distal ends of the DAAQ waveguide. For a given mesowire geometry, operating in passive or photoluminescence regimes, we quantified the emission angles by combining multi-wavelength Fourier-plane optical microscopy and photoluminescence micro-spectroscopy. We found light emission in the photoluminescence regime to be more directional in nature compared to the passive waveguiding regime, which was supported by three-dimensional finite-difference time-domain (FDTD) simulations. Second, we measured the anomalous behaviour of refractive index as a function of emission wavelength using the spectra of directionally emitted light. Third, by using spatial-filtered collection optics, we observed and quantified single-excitation dual-channel directional, active emission from DAAQ mesowire. The results discussed herein has implication not only in understanding some fundamental aspects of exciton-polariton mediated directional light emission, but also in applications such as organic optical antennas and photonic couplers.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8978/18/6/065002