Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 92: VCSELs, optical interconnects and Si photonics

HL 92.6: Talk

Thursday, March 19, 2015, 17:00–17:15, EW 202

Finite-size high-contrast gratings for VCSELs — •Anjin Liu and Dieter Bimberg — Institut für Festkörperphysik und Zentrum für Nanophotonik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany

Vertical-cavity surface-emitting lasers (VCSELs) are attractive low-cost light sources e.g. for optical interconnects in computer networks or optical sensors, providing high modulation bandwidth, lower power consumption, and symmetric beam properties. High-speed, energy-efficient, and temperature-stable VCSELs for data transmission with increasing link lengths have been demonstrated in the last few years. Nanoscale photonic structures like high-contrast gratings (HCGs) provide novel opportunities for VCSEL design and are expected to exhibit improved device performance like modulation speed, mode selectivity, and polarization control. Previous HCGs were designed with periodic boundary conditions using infinite-size plane incident waves. However, in a real device both the HCG and the incident wave are finite. Such modelling is presented here. The higher-order angular components of the finite-size incident wave are found to excite eigenmodes of the HCG causing reduced reflection and reduced reflection bandwidth. The in-plane and unidirectional transmission by the mode conversion in finite-size HCGs provide opportunities for novel applications like integrated VCSEL-based optical sensors and VCSEL-based on-chip optical interconnects.