Abstract
Integration of surface plasmon structures using semiconductor materials is limited due to the difficulties encountered in maintaining the resonance conditions upon packaging. We propose here a technology process allowing us to bond two semiconductors, such as gallium nitride (GaN) and gallium arsenide (GaAs), through a thin metal layer. This solution allows the excitation of a surface plasmon wave in an integrated classical Kretschmann configuration. The Letter presents various metal bonding conditions employed for Au deposited on both GaN/sapphire and GaAs substrates aiming at semiconductor–metal–semiconductor interfaces transparent at telecom wavelengths. The process conditions for the bondings are optimized using Ti/Au () layers on each of the wafers to be bonded under an applied pressure of 500 mbar at a low temperature of 250°C.
© 2013 Optical Society of America
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