Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 47: [DS] Micro- and nanopatterning (jointly with O)
O 47.5: Vortrag
Mittwoch, 28. März 2012, 12:45–13:00, H 0111
Photonic Crystal Gratings for High-Speed Energy-Efficient Laser Sources — •Philip Wolf1, Werner Hofmann1, Norbert Grote2, and Dieter Bimberg1 — 1IFKP & Center of Nanophotonics, TU Berlin — 2Heinrich Hertz Institute, Fraunhofer, Berlin
Recently, VCSELs with highest modulation speeds [1] and highest energy efficiencies have been demonstrated [2]. Furthermore, a novel nano-photonic element, the so-called sub-wavelength or high-contrast grating (HCG) has been successfully applied in various VCSEL structures [3-5]. This special photonic crystal can be understood as a multi-mode Fabry-Pérot interferometer being able to replace a thick distributed Bragg-mirror [3]. It has been demonstrated that a HCG can improve the modal behavior of this type of lasers [4]. We expect that this technology will enable us to demonstrate VCSEL of superior bandwidth and energy efficiency. The challenge is to implement this technology into cutting-edge high-speed device designs. Here, we like to show our new concept and present recent breakthroughs in fabrication of these photonic crystals using electron beam lithography and dry-etching with our ICP-reactor.
[1] Hofmann, W. et al.: "44 Gb/s VCSEL for optical interconnects," OFC 2011, PDPC5, 2011. [2] Moser, P. et al.: "81 fJ/bit energy-to-data ratio of 850 nm VCSEL for optical interconnects," APL, 98, 2011. [3] Chang-Hasnain, C.J. et al.: "High-Contrast Grating VCSELs," IEEE J. Sel. Top. Quantum Electron., 15, 2009. [4] Hofmann, W. et al.: "Long-Wavelength High-Contrast Grating VCSEL," IEEE Photon. J., 2, 2010. [5] Il-Sung Chung et al., IEEE PTL, 20, pp. 105, 2008.