PROMIS 2nd workshop “Modelling and design Photonics” Cadiz May 2016

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PROMIS 2nd workshop “Modelling and design Photonics” Cadiz 18-20 May 2016 PhD student: Flavio Nucciarelli

Characterization of APD devices suplied by Sheffield University Plasmonic for APD sensor Sheffiled APD Colloidal Ga NPs NPs effect on APD Plasmonic lens Characterization of APD devices suplied by Sheffield University B A C We characterize the dark current of InGaAs/InAlAs APD devices supplied by Sheffiled university It was observed how sidewalls leakage may be the most significant contribution to the dark current level in the devices Fig: ID trend related to sensors area and perimeter

Gallium nanoparticles colloidal synthesis and investigation Plasmonic for APD sensor Sheffiled APD Colloidal Ga NPs NPs effect on APD Plasmonic lens Gallium nanoparticles colloidal synthesis and investigation Silicon substrate Glass substrate Sub AZO layer Sputtering deposition Galium Evaporation AZO attack (40’’) + Water wash (10’) Ultrasonication of 1.5 mL of solvent Ga NPs colloidal solution or Drop casting (1day)

Gallium nanoparticles colloidal synthesis and investigation Plasmonic for APD sensor Sheffiled APD Colloidal Ga NPs NPs effect on APD Plasmonic lens Gallium nanoparticles colloidal synthesis and investigation Water case We characterize the Ga NPs Abs spectrum by UV spectrophotometer A significant absorption change was observe related to the pH value of the aqueous colloidal solution: for high acid or basic pH value of the solution, nanoparticles are less agglomerated

Fabrication of patterns for selective NPs evaporation on APD stuctures Plasmonic for APD sensor Sheffiled APD Colloidal Ga NPs NPs effect on APD Plasmonic lens Fabrication of patterns for selective NPs evaporation on APD stuctures Figure : (1) NPs on top active area (2) NPs on sidewalls area Contact Ga Nanoparticles Passivation layer

Plasmonic lens for APD sensor Plasmonic for APD sensor Sheffiled APD Colloidal Ga NPs NPs effect on APD Plasmonic lens Plasmonic lens for APD sensor Hole-array permit the extraordinary optical transmission (EOT) thanks to surface plasmonic polariton resonance (SPPR) and localized surface plasmonic resonance (LSPR) effects. It is possible to take advantage of EOT phenomena to fabricate plasmonic lenses. Hole-array study by Thompson et al We are going to investigate the hole-arrays design parameter on different materials like Au, Ga, aluminum zinc oxide (AZO) or zinc nitride.