Seminarium Fizyki Politechniki Wrocławskiej
PWr, bud. A1, sala 322
1D Subwavelength Photonics with Epitaxial MoSe2 and 3D Micro-printing
dr hab. Jan Suffczyński
Wydział Fizyki, Uniwersytet Warszawski
The field of sub-wavelength optics investigates the interactions between light and objects smaller than the wavelength of light. A canonical example is a subwavelength grating, which is made of dielectric slabs spaced periodically to produce a one-dimensional structure. The subwavelength grating, capable of functioning as a compact mirror and/or a high quality factor nanocavity, presents an appealing alternative to the commonly employed multilayer and bulky optical components based on Distributed Bragg Reflectors.[1]
In my talk, I will focus on subwavelength gratings in two limiting cases of the refractive index of the material that the grating is made of. First, I will show design, fabrication, and optical properties (including observation of bound states in the continuum and third harmonic generation) of subwavelength gratings made out of a tens-of-nm thick MBE-grown MoSe2 layer (refractive index as high as 4.5 at 1100 nm) [2].
In the second part of my talk, I will demonstrate subwavelength gratings produced by 3D microprinting out of a low refractive index (1.53) IP-Dip photoresist on a high refractive index cladding layer.[3] The presented flexibility of the design is promising for the application of subwavelength gratings in scalable, high-performance, integrated photonics.
[1] M. Marciniak et al., Impact of stripe shape on the reflectivity of monolithic high contrast gratings, ACS Photonics 8, 3173 (2021).
[2] E. Pruszyńska-Karbownik et al., Optical bound states in the continuum in subwavelength gratings made of an epitaxial van der Waals material, ACS Nano (2026).
[3] E. Pruszyńska-Karbownik et al., Concept of Inverted Refractive-Index-Contrast Grating Mirror and Exemplary Fabrication by 3D Microprinting, Nanophotonics 12, 3579 (2023).
