CC BY
7*
ALT'23
The 30th International Conference on Advanced Laser Technologies
P-I-3
Bloch surface waves for integrated nanophotonics
A.A. Fedyanin
Faculty of Physics, Lomonosov Moscow State University, Moscow 119991, Russia [email protected]
Modern integrated photonic platforms should combine low-loss guiding, spectral flexibility, high light confinement, and close packing of optical components. One of the prominent platforms represents dielectric nanostructures combined with photonic band gap media that manipulate low-loss Bloch surface waves (BSW). BSW platform is all-dielectric counterpart to surface plasmon-polariton one, but it has the advantages of long propagation length (up to cm in visible), ultrawide spectral range of operation (from UV to mid-IR and THz), and access to the confined electromagnetic field making BSW applicable for integrated photonics, sensing, and other fields. Here, we developed several ways for directed and highly efficient BSW excitation using dielectric nanostructures of various designs on the photonic crystal (PC) surface. First, we achieve color-selective directional excitation of BSW mediated by Mie resonances in a semiconductor nanoparticle printed on the PC surface using laser-induced backward transfer technique. We show that a single silicon nanoparticle can be used as a subwavelength multiplexer switching the BSW excitation direction from forward to backward within the 30 nm spectral range with its central wavelength governed by the nanoparticle size. Numerical simulation gives an estimate of 8% BSW excitation efficiency with a single nanoparticle. Second, we show a new concept of 3D out-of-plane coupler which is a microscale prism exploiting frustrated total internal reflection in the Otto configuration for unidirectional excitation of waveguide modes with efficiency up to 100%. Polymer microprisms are printed using two-photon laser lithography and allow transferring more than 40% of the incident light energy into BSWs. The couplers enable focusing BSWs simultaneously with their excitation. Finally, halide perovskite micro- and nanolasers were integrated with BSW platform and demonstrated directional BSW excitation with the efficiency of over 16%. A pronounced BSW beam steering effect is shown.
