2016/06/23 by Tong Wu, Xiuhui Zhang, Rongyao Wang +1 · 33 citations
Chemistry · Computer Science · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Dipole #Gold and Silver Nanoparticles Synthesis and Applications #Magnetic dipole #Magnetic nanoparticles #Materials science #Metamaterial #Molecular physics #Molecule #Nanoparticle #Nanotechnology #Nuclear magnetic resonance #Optics #Optoelectronics #Physics #Quantum Dots Synthesis And Properties #Quantum Information and Cryptography #Raman optical activity #Raman spectroscopy #physics.optics
paper · pdf · doi:10.1021/acs.jpcc.6b03446
published in The Journal of Physical Chemistry C 120(27), 14795-14804 (American Chemical Society) · 36 pages, 7 figures
openalex publication_date 2016/06/23 · arxiv created 2017/12/25 · arxiv updated 2017/12/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
An analytical theory for the surface-enhanced Raman optical activity (SEROA) with the magnetic response of the substrate particle has been presented. We have demonstrated that the SEROA signal is proportional to the magnetic polarizability of the substrate particle, which can be significantly enhanced due to the existence of the magnetic response. At the same time, a large circular intensity difference (CID) for the SEROA can also be achieved in the presence of the magnetic response. Taking Si nanoparticles as examples, we have found that the CID enhanced by a Si nanoparticle is 10 times larger than that of Au. Furthermore, when the molecule is located in the hotspot of a Si dimer, CID can be 60 times larger. The phenomena originate from large magnetic fields concentrated near the nanoparticle and boosted magnetic dipole emission of the molecule. The symmetric breaking of the electric fields caused by the magnetic dipole response of the nanoparticle also plays an important role. Our findings provide a new way to tailor the Raman optical activity by designing metamaterials with the strong magnetic response.