Far-field nanoscale infrared spectroscopy of vibrational fingerprints of molecules with graphene plasmons.

ABSTRACT: Infrared spectroscopy, especially for molecular vibrations in the fingerprint region between 600 and 1,500 cm(-1), is a powerful characterization method for bulk materials. However, molecular fingerprinting at the nanoscale level still remains a significant challenge, due to weak light-matter interaction between micron-wavelengthed infrared light and nano-sized molecules. Here we demonstrate molecular fingerprinting at the nanoscale level using our specially designed graphene plasmonic structure on CaF2 nanofilm. This structure not only avoids the plasmon-phonon hybridization, but also provides in situ electrically-tunable graphene plasmon covering the entire molecular fingerprint region, which was previously unattainable. In addition, undisturbed and highly confined graphene plasmon offer

SUBMITTER: Hu H 

PROVIDER: S-EPMC4974468 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature