Active magnetoplasmonic ruler.
Plasmon rulers are an emerging concept in which the strong near-field coupling of plasmon nanoantenna elements is employed to obtain structural information at the nanoscale. Here, we combine nanoplasmonics and nanomagnetism to conceptualize a magnetoplasmonic dimer nanoantenna that would be able to report nanoscale distances while optimizing its own spatial orientation. The latter constitutes an active operation in which a dynamically optimized optical response per measured unit length allows for the measurement of small and large nanoscale distances with about 2 orders of magnitude higher precision than current state-of-the-art plasmon rulers. We further propose a concept to optically measure the nanoscale response to the controlled application of force with a magnetic field.
†Department of Applied Physics, Chalmers University of Technology, Göteborg 41296, Sweden.
Irina
I
Zubritskaya
†Department of Applied Physics, Chalmers University of Technology, Göteborg 41296, Sweden.
Kristof
K
Lodewijks
‡CIC nanoGUNE, Donostia-San Sebastian 20018, Spain.
Nicolò
N
Maccaferri
†Department of Applied Physics, Chalmers University of Technology, Göteborg 41296, Sweden.
Addis
A
Mekonnen
§Department of Physics, University of Gothenburg, Gothenburg 412 96, Sweden.
Randy K
RK
Dumas
§Department of Physics, University of Gothenburg, Gothenburg 412 96, Sweden.|⊥Materials Physics, School of Information and Communication Technology, KTH Royal Institute of Technology, 16440 Kista, Sweden.
Johan
J
Åkerman
‡CIC nanoGUNE, Donostia-San Sebastian 20018, Spain.|∥IKERBASQUE, Basque Foundation for Science, Bilbao 48011, Spain.
Paolo
P
Vavassori
†Department of Applied Physics, Chalmers University of Technology, Göteborg 41296, Sweden.
Alexandre
A
Dmitriev
cobalt; dimer; localized surface plasmon resonance; magneto-optical Kerr effect (MOKE); magnetoplasmonics; nickel; plasmon ruler