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Spatially resolved emission spectra of a homogenously excited dot , exemplarily for a power below and above threshold (contour area) and emission intensity response toward increasing pump energies. The spatial intensity distribution shows the increasing number of maxima for higher energy modes. From the log-plot of the emission intensity plot follows, that lines, exhibiting only one field maximum in the center can overcome their respective laser threshold , while the remaining ones show linear increase in spontaneous emission.
Far-field emission spectra of another organic photonic dot , selectively excited at three different positions. For each configuration, we observe at least one discrete lasing mode (contour area), verified by Input-Output characteristics. The emission wavelength of these modes, as well as the specific beam position within the dot is indicated in each spectrum, for central (a) edge (b) and corner (c) excitation, respectively.
Calculated intensity distribution of the electric field for three different positions of a gain region within a lossy waveguide structure. The size of the waveguide is and the gain region describes a cylinder with a diameter of . For the losses, we set , whereas the gain has a value of up to . Indicated are the calculated spectral mode positions , as well as a net loss (positive ) or net gain (negative ).
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