Over the last years our investigation on polaronic, photonic and plasmonic crystals has revealed photonic / plasmon effects that increase the magneto-optic response [see, e.g., References 1-5 below]. Additionally, we have demonstrated the nonreciprocal propagation of plasmons in the presence of magnetic fields . All this research is relevant to achieving unidirectional propagation of spatially confined electromagnetic waves, indispensable for the development of on-chip optical communications in photonic circuitry.
We pursue different approaches that aim towards creating actively controllable nanophotonic devices: (i) integration of electro- and magneto-optic materials into nanophotonic metasurfaces to enable using electric (magnetic) fields to control confined electromagnetic waves; (ii) special topologies designed in the wavevector space that enable helical edge propagation of modes that flow unimpeded by imperfections or back-reflections. The latter are akin to quantum spin Hall in fermionic systems, which have been demonstrated in honeycomb photonic dielectric lattices.
Among other methodologieswe exploit finite-difference time-domain (FDTD) simulations to design metasurfaces and topological photonic crystals and angle-resolved reflectance/transmission spectroscopy, which can resolve reciprocal space maps from near-IR to violet, with scanning beam sizes down to few microns. Beyond the more common real space imaging, this methodology enables the direct visualization of the photonic bands structure.
 JM. Caicedo et al., ACS Nano, 2011. DOI: 10.1021/nn1035872
 Rubio-Roy et al., Langmuir 2012. DOI: 10.1021/la301239x
 Vlasin et al., Physical Review Applied 2014. https://doi.org/10.1103/PhysRevApplied.2.054003
 Casals et al. Physical Review Letters 2016, https://doi.org/10.1103/PhysRevLett.117.026401
 R. Cichelero et al., Optics Express 26 34842-34852 (2018) https://doi.org/10.1364/OE.26.034842