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Phys Rev Lett. 2006 Apr 21;96(15):153902. Epub 2006 Apr 21.

Inverse design for full control of spontaneous emission using light emitting scattering optical elements.

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  • 1Wave Phenomena Group, Nanophotonics Technology Center, Polytechnic University of Valencia, C/Camino de Vera s/n, E-46022, Valencia, Spain.


Full control of spontaneous emission is essential in various fields of optics. This work presents an inverse designed light-emitting scattering optical element that includes full control of spontaneously emitted photons (i.e., enhancement at a central frequency and suppression at neighboring frequencies) and directionality of the output beam. This is achieved by embedding a one-dimensional optical active element inside a cluster of square shaped gallium arsenide dielectric rods whose positions are optimized by a genetic algorithm. Large spontaneous emission enhancement of > 70 is predicted at the transition wavelength if high-quality sources are employed. Moreover, neighboring wavelengths are simultaneously suppressed over 10 times. Finally, the radiated beam is highly collimated to only 6 degrees and contains 30 times the energy emitted by the source placed in free space.

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