Abstract
Abstract We demonstrate a novel all-dielectric magnetophotonic structure that consists of two-dimensional arrays of bismuth substituted iron-garnet nanocylinders supporting both localized (Fabry–Perot-like) and lattice (guided-like) optical modes. Simultaneous excitation of the two kinds of modes provides a significant enhancement of the Faraday effect by 3 times and transverse magneto-optical Kerr effect by an order of magnitude compared to the smooth magnetic film of the same effective thickness. Both magneto-optical effects are boosted in wide spectral and angular ranges making the nanocylinder array magnetic dielectric structures promising for applications with short and tightly focused laser pulses.
Highlights
Nowadays, the magneto-optical effects are widely used in different devices [1] such as routers [2], optical isolators [3,4,5], magneto-optical sensors [6,7,8,9,10,11,12], modulators, and magnetometers [13,14,15,16]
The samples under research are two-dimensional arrays of cylinders etched in bismuth-substituted iron garnet (BIG) thin film of Bi1.0Lu0.5Gd1.5Fe4.2Al0.8O12/Bi2.8Y0.2Fe5.0O12 deposited by magnetron sputtering on a SiO2 substrate (Figure 1)
The transmittance was about 16%, which allowed us to observe the magneto-optical polarization and intensity effects in the transmitted light, while usually studies of the plasmonic structures focus on the reflectance configuration [28, 42,43,44]. We show that such transparency is accompanied by 20-times enhancement of the light intensity inside the magnetic material of the structure and significant amplification of the magneto-optical effects
Summary
The magneto-optical effects are widely used in different devices [1] such as routers [2], optical isolators [3,4,5], magneto-optical sensors [6,7,8,9,10,11,12], modulators, and magnetometers [13,14,15,16]. The possibility of the enhancement of the magneto-optical effects was reported for structures that maintain simultaneously several kinds of optical modes [47, 48] Metals in such structures cause high absorption losses, broadening of observed resonances and decrease of the base (transmitted) signal. We show the enhancement of the Faraday and transverse magneto-optical Kerr effect (TMOKE) in the two-dimensional arrays of cylinders made of bismuthsubstituted iron-garnet that support both localized (Fabry–Pérot-like) and lattice (guided-like) modes Simultaneous excitation of these modes makes it possible to increase the Faraday rotation by 3 times compared to the smooth magnetic film of the equal effective thickness. The one-order increase of TMOKE is observed in the structure in a wide angular range
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
