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Radial cavity mode excitation in fluorescent core-shell microcavities
8.S. Blair and Y. Chen, Appl. Opt. 40, 570 (2001).
10.The distribution of the bead size is specified to 20%; however, we found diameters typically in the range from .
11.The spectral characteristics of the lower cutoff are determined by the Notch filter required for suppression of the excitation laser. The upper one is given by the spectral range of the monochromator.
12.The laser was operated at a fixed frequency and not tuned to match the cavity modes, since the spectral position of the latter varied from particle to particle, and tuning would have required a delicate realignment of the microscope’s Notch filter.
13.We used rough and polished silicon wafers as well as glass cover slips as substrates to assure that the bead/substrate interface had no influence on the spectra, which actually could be confirmed.
14.Power density as calculated from output power of the Ar ion laser focused to a spot by means of the objective. Reflection losses inside the microscope are neglected. This power density is still well below the lasing threshold of the particles, which was determined to be about in a pulsed laser experiment (Ref. 20).
16.A more thorough treatment based on Mie theory yielded the same result. Cf. Ref. 20.
17.Average over all values of .
18.Maximum deviation out of five independent experiments with five different beads.
19.The experimental details of this coating procedure can be found in G. Kaltenpoth, M. Himmelhaus, L. Slansky, F. Caruso, and M. Grunze, Adv. Mater. (Weinheim, Ger.) 15, 1113 (2003) and references therein.
20.A. Weller, diploma thesis, University of Heidelberg, 2005.
21.Since we had to work at fixed frequency (cf. comment above) whether pumping was resonant or not was simply decided by the bead size, which varied according to the size distribution of the suspension. However, despite the large number of particles investigated , we never found any effects, such as strongly enhanced emission, in the spectra which might indicate resonant pumping. This further corroborates our conclusion.
22.W. Koechner, Solid State Laser Engineering (Springer, New York, 2006), p. 200.
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