We propose a plasmonic gold nanodipole array on silicon, forming a Schottky contact thereon, and covered by water. The behavior of this array under normal excitation has been extensively investigated. Trends have been found and confirmed by identification of the mode propagating in nanodipoles and its properties. This device can be used to detect infrared radiation below the bandgap energy of the substrate via internal photoelectric effect (IPE). Also we estimate its responsivity and detection limit. Finally, we assess the potential of the structure for bulk and surface (bio) chemical sensing. Based on modal results an analytical model has been proposed to estimate the sensitivity of the device. Results show a good agreement between numerical and analytical interpretations.

Additional Metadata
Keywords Biosensor, Bulk sensitivity and Surface sensitivity, Nanodipole array, Rectenna, Schottky, Surface plasmons
Persistent URL dx.doi.org/10.1117/12.2036203
Conference Photonics North 2013 Conference
Citation
Alavirad, M. (Mohammad), Mousavi, S.S. (Saba Siadat), Roy, L, & Berini, P. (Pierre). (2013). Schottky-contact plasmonic rectenna for biosensing. In Proceedings of SPIE - The International Society for Optical Engineering. doi:10.1117/12.2036203