Details

Autor(en) / Beteiligte

• Rizal, Conrad
• Pisana, Simone
• Hrvoic, Ivan
• Fullerton, Eric E

Titel

Microstructure and magneto-optical surface plasmon resonance of Co/Au multilayers

Ist Teil von

• Journal of physics communications, 2018-05, Vol.2 (5), p.55010

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2018

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Magneto-optical surface plasmon resonance (MOSPR) sensors benefit from a magneto-optic enhancement with respect to surface plasmon resonance (SPR) sensors, making these devices attractive for biosensing applications. Typical design compromises seek to balance magneto-optic effects and optical losses associated with surface plasmon waves extending to the ferromagnetic layer. Here, we demonstrate that Co/Au multilayers can yield sizeable MOSPR improvements in spite of the relative high total Co layer thickness. Co (tCo)/Au (2 nm) multilayers, with 1.2 ≤ tCo ≤ 1.8 nm are prepared and characterized. X-ray analysis shows that the microstructure maintains high layer periodicity and improves upon annealing. The multilayer structures were then modeled to study their SPR/MOSPR sensitivities, suggesting that the MOSPR sensitivity is enhanced by a factor of up to 3 and 4 with respect to the SPR sensitivity when the devices are operated in Air and Water media, respectively. We find that multilayers provide a particular advantage when operating the sensors in Water-based media.