Tip-Enhanced Sum Frequency Generation for Molecular Vibrational Nanospectroscopy
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866909589473067008 |
|---|---|
| author | Sakurai, Atsunori Takahashi, Shota Mochizuki, Tatsuto Sugimoto, Toshiki |
| author_facet | Sakurai, Atsunori Takahashi, Shota Mochizuki, Tatsuto Sugimoto, Toshiki |
| contents | Vibrational sum frequency generation (SFG) is a nonlinear spectroscopic technique widely used to study the molecular structure and dynamics of surface systems. However, the spatial resolution achieved by far-field observations is constrained by the diffraction limit, obscuring molecular details in inhomogeneous structures smaller than the wavelength of light. To overcome this limitation, we developed a system for tip-enhanced SFG (TE-SFG) spectroscopy based on a scanning tunneling microscope. We successfully detected vibrational TE-SFG signals from adsorbed molecules on a gold substrate under ambient conditions. The phase analysis of interferometric SFG spectra provided information on molecular orientation. Furthermore, the observed TE-SFG signal was confirmed to originate from a highly localized region within a gap between the tip apex and the sample substrate. This method offers a novel platform for nonlinear optical nanospectroscopy, paving the way for the investigation of surface molecular systems beyond the diffraction limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_18909 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tip-Enhanced Sum Frequency Generation for Molecular Vibrational Nanospectroscopy Sakurai, Atsunori Takahashi, Shota Mochizuki, Tatsuto Sugimoto, Toshiki Optics Mesoscale and Nanoscale Physics Chemical Physics Vibrational sum frequency generation (SFG) is a nonlinear spectroscopic technique widely used to study the molecular structure and dynamics of surface systems. However, the spatial resolution achieved by far-field observations is constrained by the diffraction limit, obscuring molecular details in inhomogeneous structures smaller than the wavelength of light. To overcome this limitation, we developed a system for tip-enhanced SFG (TE-SFG) spectroscopy based on a scanning tunneling microscope. We successfully detected vibrational TE-SFG signals from adsorbed molecules on a gold substrate under ambient conditions. The phase analysis of interferometric SFG spectra provided information on molecular orientation. Furthermore, the observed TE-SFG signal was confirmed to originate from a highly localized region within a gap between the tip apex and the sample substrate. This method offers a novel platform for nonlinear optical nanospectroscopy, paving the way for the investigation of surface molecular systems beyond the diffraction limit. |
| title | Tip-Enhanced Sum Frequency Generation for Molecular Vibrational Nanospectroscopy |
| topic | Optics Mesoscale and Nanoscale Physics Chemical Physics |
| url | https://arxiv.org/abs/2411.18909 |