We report on the fabrication and optical properties of thin metal films periodically patterned with square hole arrays of 2 micron pitch, which behave as substrateless plasmonic devices at mid-infrared frequencies. Large (3x3 mm(2)) meshes were fabricated by metallizing a patterned silicon nitride membrane. The mid-infrared spectra display resonant absorption lines with a Q-factor up to 22 in both transmission and reflection, due to the interaction of the radiation with surface plasmon modes on both faces of the film, allowed by substrate removal. The devices can be used to fabricate surface plasmon-based chemical sensors employing mid-infrared radiation.
Substrateless micrometric metal mesh for mid-infrared plasmonic sensors / F., Mattioli; Ortolani, Michele; Lupi, Stefano; Limaj, Odeta; Leoni, Riccardo. - In: APPLIED PHYSICS. A, MATERIALS SCIENCE & PROCESSING. - ISSN 0947-8396. - STAMPA. - 103:3(2011), pp. 627-630. (Intervento presentato al convegno 35th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2010 tenutosi a Rome nel 5 September 2010 through 10 September 2010) [10.1007/s00339-010-6194-y].
Substrateless micrometric metal mesh for mid-infrared plasmonic sensors
ORTOLANI, MICHELE;LUPI, Stefano;LIMAJ, ODETA;LEONI, Riccardo
2011
Abstract
We report on the fabrication and optical properties of thin metal films periodically patterned with square hole arrays of 2 micron pitch, which behave as substrateless plasmonic devices at mid-infrared frequencies. Large (3x3 mm(2)) meshes were fabricated by metallizing a patterned silicon nitride membrane. The mid-infrared spectra display resonant absorption lines with a Q-factor up to 22 in both transmission and reflection, due to the interaction of the radiation with surface plasmon modes on both faces of the film, allowed by substrate removal. The devices can be used to fabricate surface plasmon-based chemical sensors employing mid-infrared radiation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
