Garnet-based magnetoplasmonic heterostructures with 1D photonic crystals for highly effective chemo- and biosensing
Mohammad Nur-E-Alam, Edith Cowan UniversityFollow
Kamal Alameh, Edith Cowan UniversityFollow
Institute of Electrical and Electronics Engineers Inc.
School of Science
Summary form only given. We present a novel type of magnetoplasmonic heterostructures containing one-dimensional photonic crystals. We performed the design of the magnetoplasmonic heterostructures and tuned the parameters of the structure in order to enhance the magneto-optical response via excitation of the ultralong-range propagating surface plasmon polariton mode. This structure is designed for gas sensing at the operating wavelength of 790 nm. One-dimensional photonic crystal (PC) is used to tune the impedance of the heterostructure so that the long-range propagating modes can be excited. Our sample contains 1D PC made of alternating SiO2 and Ta2O5 layers of thickness 164 nm and 119.4 nm correspondingly. PC structure is coated with a 125-nm thick ferromagnetic film of bismuth-substituted iron garnet and 8-nm thick gold film for the excitation of the SPPs. Some part of the structure is not coated with a gold film therefore providing a possibility to excite another type of the surface electromagnetic modes in fully dielectric magnetophotonic structure.