Giant magneto-optical Kerr enhancement from films on SiC due to the optical properties of the substrate
Journal Article
·
· Physical Review B
- State Univ. of New York, Buffalo, NY (United States); DOE/OSTI
- State Univ. of New York, Buffalo, NY (United States); U.S. Naval Research Lab., Washington, DC (United States)
- State Univ. of New York, Buffalo, NY (United States)
- U.S. Naval Research Lab., Washington, DC (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
We report a giant enhancement of the midinfrared magneto-optical complex Kerr angle (polarization change of reflected light) in a variety of materials grown on SiC. In epitaxially grown multilayer graphene, the Kerr angle is enhanced by a factor of 68, which is in good agreement with Kerr signal modeling. Strong Kerr enhancement is also observed in Fe films grown on SiC and Al-doped bulk SiC. Our experiments and modeling indicate that the enhancement occurs at the high-energy edge of the SiC reststrahlen band where the real component of the complex refractive index n˜ passes through unity. Furthermore, since the signal is greatly enhanced when n˜ = 1, the enhancement is predicted to exist over the entire visible and IR spectrum for a free-standing film. We also predict similar giant enhancement in both Faraday (transmission) and Kerr rotation for thin films on a metamaterial substrate with refractive index n˜ = –1. Furthermore, this paper demonstrates that the substrate used in magneto-optical Kerr effect (MOKE) measurements must be carefully chosen when investigating magneto-optical materials with weak MOKE signals or when designing MOKE-based optoelectronic devices.
- Research Organization:
- State Univ. of New York (SUNY), Albany, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China
- Grant/Contract Number:
- SC0004890
- OSTI ID:
- 1610762
- Alternate ID(s):
- OSTI ID: 1496902
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 8 Vol. 99; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Wide-band enhancement of the transverse magneto-optical Kerr effect in magnetite-based plasmonic crystals
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