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Controlling the directional emission of holey organic microlasers
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Outline of a holey stadium-shaped cavity. The stadium itself is composed of two half circles (radius ) and a rectangle (length ), with an aspect ratio . The circular vacancy is characterized by its radius and the position of its center. The angle specifies the direction of observation. (b) Some periodic orbits in a stadium-shaped cavity.

Image of FIG. 2.
FIG. 2.

First column [(a), (c), (e), (g), and (i)]: experimental (continuous red line) and numerical (dotted black line) far-field pattern. Second column [(b), (d), (f), (h), and (j)]: photographs of organic microlasers from an optical microscope. (b) Scheme of the hole effect on the rays, superimposed on the photograph. For all these cavities, and . For [(a)–(h)] and with symmetries according to the stadium axes. For (i) and (j), and .

Image of FIG. 3.
FIG. 3.

(a) Spectrum measured at the direction of maximal emission from the cavity shown in Fig. 2(j) with . The pump intensity is about 1.5 times higher than the lasing threshold. (b) Fourier transforms of the spectrum of a full stadium-shaped microlaser with and (dotted line) and of the spectrum in (a) (continuous line). The optical paths of the rectangle and the perimeter for are indicated with arrows.


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Scitation: Controlling the directional emission of holey organic microlasers