Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 72: Plasmonics and Nanooptics VI
O 72.12: Vortrag
Donnerstag, 25. März 2010, 17:45–18:00, H32
Plasmonic Collimation for near-IR Laser Diodes — •Xinghui Yin1,2, Justin White3, Mark Brongersma3, and Thomas Taubner1,2 — 1RWTH Aachen — 2Fraunhofer-Institut für Lasertechnik — 3Stanford University
It is known that one can use gratings to couple freely-propagating light to plasmon modes. Ebbesen [1] examined the reverse process at a metallic slit-grating structure and discovered a beaming effect. Subsequently, Capasso [2] successfully combined such a structure with a Quantum Cascade Laser at a mid-infrared wavelength of λ = 9.8 µ m to reduce the beam divergence in one direction.
In our work, we investigate plasmonic collimators for laser diodes at near-infrared wavelengths. We focus on optimizing the structure parameters for λ =960 nm. In this region, it is important to take the higher surface plasmon propagation losses into consideration. Also, we examine the efficiency of plasmonic collimation compared to conventional laser diode collimation by cylindric lenses.
The simulations are carried out using a 2D Finite Difference Frequency Domain code developed by J. White. Using the obtained parameters, we fabricate the plasmonic collimator and characterize it.
[1] Ebbesen et al., 2002, Vol 297, Science
[2] Capasso et al., Nature Photonics, 2008
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