| AVS 66th International Symposium & Exhibition | |
| Nanometer-scale Science and Technology Division | Wednesday Sessions |
| Session NS-WeM |
| Session: | Optics and Scattering on the Nanoscale |
| Presenter: | Zhenrong Zhang, Baylor University |
| Authors: | B. Birmingham, Baylor University K. Minn, Baylor University B. Ko, Baylor University H. Lee, Baylor University Z. Zhang, Baylor University |
| Correspondent: | Click to Email |
Probing light-matter interaction in nanoscale regime requires the efficient delivery and collection of electromagnetic energy to and from the nanoscale region of interest. Metallic plasmonic nano-probes can efficiently excite and detect the near-field at nanoscale for near-field imaging and sensing applications such as tip-enhanced Raman spectroscopy (TERS). We have studied the interaction of molecules with bulk MoS2, a semiconductor, using TERS. MoS2, has attracted tremendous attention due to promising applications in electronics, photonics, and catalysis. Here we have compared the difference in the interaction of sub-monolayer copper phythalocyanine (CuPc) molecules with MoS2 and Au. The relative Raman peak ratio and Raman peak position shift from spatial TERS mapping show the difference in the adsorbates-adsorbates interaction and the adsorbates-substrates interaction on Au and MoS2 substrates.
We also propose a photonic-plasmonic probe for nanoscale confinement of light. In our device, light in a fiber couples with the surface plasmons of a nano-antenna. The coupled plasmonic mode then propagates down the conical waveguide to the narrow apex where it gets localized and strongly focused, exhibiting immense field enhancement. By changing the structures at the fiber-antenna interface, the linearly polarized fiber mode is converted to radial surface plasmon polaritons (SPP’s) through asymmetric coupling. The probe can be implemented into TERS setup to obtain spectroscopic information at the nanoscale.