title: Midinfrared Plasmon-Enhanced Spectroscopy with Germanium Antennas on Silicon Substrates.
abstract: Midinfrared plasmonic sensing allows the direct targeting of unique vibrational fingerprints of molecules. While gold has been used almost exclusively so far, recent research has focused on semiconductors with the potential to revolutionize plasmonic devices. We fabricate antennas out of heavily doped Ge films epitaxially grown on Si wafers and demonstrate up to 2 orders of magnitude signal enhancement for the molecules located in the antenna hot spots compared to those located on a bare silicon substrate. Our results set a new path toward integration of plasmonic sensors with the ubiquitous CMOS platform.
authors.affiliation: Dipartimento di Fisica, Università di Roma "La Sapienza" , Piazzale Aldo Moro 5, I-00185 Roma, Italy.|Center for Life Nano Science@Sapienza, Istituto Italiano di Tecnologia , Viale Regina Elena 291, I-00161 Roma, Italy.
authors.forename: Leonetta
authors.initials: L
authors.lastname: Baldassarre
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano , Piazza Leonardo da Vinci 32, I-20133 Milano, Italy.
authors.forename: Emilie
authors.initials: E
authors.lastname: Sakat
authors.affiliation: LNESS, Dipartimento di Fisica del Politecnico di Milano, polo di Como , via Anzani 42, I-22100 Como, Italy.
authors.forename: Jacopo
authors.initials: J
authors.lastname: Frigerio
authors.affiliation: School of Engineering, University of Glasgow , Rankine Building, Oakfield Avenue, Glasgow G12 8LT, U.K.
authors.forename: Antonio
authors.initials: A
authors.lastname: Samarelli
authors.affiliation: School of Engineering, University of Glasgow , Rankine Building, Oakfield Avenue, Glasgow G12 8LT, U.K.
authors.forename: Kevin
authors.initials: K
authors.lastname: Gallacher
authors.affiliation: Dipartimento di Fisica, Università di Roma "La Sapienza" , Piazzale Aldo Moro 5, I-00185 Roma, Italy.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Calandrini
authors.affiliation: LNESS, Dipartimento di Fisica del Politecnico di Milano, polo di Como , via Anzani 42, I-22100 Como, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Isella
authors.affiliation: School of Engineering, University of Glasgow , Rankine Building, Oakfield Avenue, Glasgow G12 8LT, U.K.
authors.forename: Douglas J
authors.initials: DJ
authors.lastname: Paul
authors.affiliation: Dipartimento di Fisica, Università di Roma "La Sapienza" , Piazzale Aldo Moro 5, I-00185 Roma, Italy.
authors.forename: Michele
authors.initials: M
authors.lastname: Ortolani
authors.affiliation: Dipartimento di Fisica, Politecnico di Milano , Piazza Leonardo da Vinci 32, I-20133 Milano, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Biagioni
keywords: Silicon technology; explosives detection; mid-infrared spectroscopy; plasmonics