TY  - JOUR
A1  - Scheunert, Gunther
A1  - Cohen, Sidney R.
A1  - Kullock, René
A1  - McCarron, Ryan
A1  - Rechev, Katya
A1  - Kaplan-Ashiri, Ifat
A1  - Bitton, Ora
A1  - Dawson, Paul
A1  - Hecht, Bert
A1  - Oron, Dan
T1  - Grazing-incidence optical magnetic recording with super-resolution
JF  - Beilstein Journal of Nanotechnology
N2  - Heat-assisted magnetic recording (HAMR) is often considered the next major step in the storage industry: it is predicted to increase the storage capacity, the read/write speed and the data lifetime of future hard disk drives. However, despite more than a decade of development work, the reliability is still a prime concern. Featuring an inherently fragile surface-plasmon resonator as a highly localized heat source, as part of a near-field transducer (NFT), the current industry concepts still fail to deliver drives with sufficient lifetime. This study presents a method to aid conventional NFT-designs by additional grazing-incidence laser illumination, which may open an alternative route to high-durability HAMR. Magnetic switching is demonstrated on consumer-grade CoCrPt perpendicular magnetic recording media using a green and a near-infrared diode laser. Sub-500 nm magnetic features are written in the absence of a NFT in a moderate bias field of only μ0H = 0.3 T with individual laser pulses of 40 mW power and 50 ns duration with a laser spot size of 3 μm (short axis) at the sample surface – six times larger than the magnetic features. Herein, the presence of a nanoscopic object, i.e., the tip of an atomic force microscope in the focus of the laser at the sample surface, has no impact on the recorded magnetic features – thus suggesting full compatibility with NFT-HAMR.
KW  - laser absorption
KW  - laser heating
KW  - thermally assisted magnetic recording
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-181457
VL  - 8
ER  - 
TY  - JOUR
A1  - Aeschlimann, Martin
A1  - Brixner, Tobias
A1  - Cinchetti, Mirko
A1  - Frisch, Benjamin
A1  - Hecht, Bert
A1  - Hensen, Matthias
A1  - Huber, Bernhard
A1  - Kramer, Christian
A1  - Krauss, Enno
A1  - Loeber, Thomas H.
A1  - Pfeiffer, Walter
A1  - Piecuch, Martin
A1  - Thielen, Philip
T1  - Cavity-assisted ultrafast long-range periodic energy transfer between plasmonic nanoantennas
JF  - Light: Science & Applications
N2  - Radiationless energy transfer is at the core of diverse phenomena, such as light harvesting in photosynthesis\(^1\), energy-transfer-based microspectroscopies\(^2\), nanoscale quantum entanglement\(^3\) and photonic-mode hybridization\(^4\). Typically, the transfer is efficient only for separations that are much shorter than the diffraction limit. This hampers its application in optical communication and quantum information processing, which require spatially selective addressing. Here, we demonstrate highly efficient radiationless coherent energy transfer over a distance of twice the excitation wavelength by combining localized and delocalized\(^5\) plasmonic modes. Analogous to the Tavis-Cummings model, two whispering-gallery-mode antennas\(^6\) placed in the foci of an elliptical plasmonic cavity\(^7\) fabricated from single-crystal gold plates act as a pair of oscillators coupled to a common cavity mode. Time-resolved two-photon photoemission electron microscopy (TR 2P-PEEM) reveals an ultrafast long-range periodic energy transfer in accordance with the simulations. Our observations open perspectives for the optimization and tailoring of mesoscopic energy transfer and long-range quantum emitter coupling.
KW  - chemistry
KW  - nanocavities
KW  - nanophotonics and plasmonics
KW  - photonic devices
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-173265
VL  - 6
ER  -