| Title | Far-field nanoscale infrared spectroscopy of vibrational fingerprints of molecules with graphene plasmons |
| Authors | Hu, Hai Yang, Xiaoxia Zhai, Feng Hu, Debo Liu, Ruina Liu, Kaihui Sun, Zhipei Dai, Qing |
| Affiliation | Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China. Zhejiang Normal Univ, Dept Phys, Jinhua 321004, Peoples R China. Peking Univ, Sch Phys, Ctr Nanochem, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China. Aalto Univ, Dept Micro & Nanosci, Tietotie 3, FI-02150 Espoo, Finland. Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China. Liu, KH (reprint author), Peking Univ, Sch Phys, Ctr Nanochem, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China. Sun, ZP (reprint author), Aalto Univ, Dept Micro & Nanosci, Tietotie 3, FI-02150 Espoo, Finland. |
| Keywords | HEXAGONAL BORON-NITRIDE ABSORPTION-SPECTROSCOPY MIDINFRARED PLASMONICS NANOANTENNA ARRAYS REAL-TIME HETEROSTRUCTURES MONOLAYERS TERAHERTZ OXIDE NANOSPECTROSCOPY |
| Issue Date | 2016 |
| Publisher | Nature Communications |
| Citation | Nature Communications.2016,7. |
| 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 offers simultaneous detection of in-plane and out-of-plane vibrational modes with ultrahigh detection sensitivity down to the sub-monolayer level, significantly pushing the current detection limit of far-field mid-infrared spectroscopies. Our results provide a platform, fulfilling the long-awaited expectation of high sensitivity and selectivity far-field fingerprint detection of nano-scale molecules for numerous applications. |
| URI | http://hdl.handle.net/20.500.11897/492016 |
| ISSN | 2041-1723 |
| DOI | 10.1038/ncomms12334 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 |
