Abstract
We report on the first realization of photonic crystal structures in 600-nm thick ion-sliced, single-crystalline lithium niobate thin films bonded on a lithium niobate substrate using adhesive polymer benzocyclobutene (BCB). Focused ion beam (FIB) milling is used for fast prototyping of photonic crystal structures with regular cylindrical holes. Unwanted redeposition effects leading to conically shaped holes in lithium niobate are minimized due to the soft BCB layer underneath. A high refractive index contrast of 0.65 between the lithium niobate thin film and the BCB underlayer enables strong light confinement in the vertical direction. For TE polarized light a triangular photonic crystal lattice of air holes with a diameter of 240 nm and a separation of 500 nm has a photonic bandgap in the wavelength range from 1390 to 1500 nm. Experimentally measured transmission spectra show a spectral power dip for the GK direction of the reci ocal lattice with an extinction ratio of up to 15 dB. This is in good agreement with numerical simulations based on the three-dimensional plane wave expansion (PWE) and the finite-difference time-domain (FDTD) method.
Highlights
Photonic crystals - metamaterials with periodical refractive index modulation - offer unique properties to control the flow of light
The aim of this work is to lay the groundwork for electro-optically tunable photonic crystals in ion-sliced LiNbO3 thin films
To find the best suited photonic crystal parameters, calculations based on models from the second chapter will be performed and feasible photonic crystal structures in lithium niobate will systematically be analyzed
Summary
Photonic crystals - metamaterials with periodical refractive index modulation - offer unique properties to control the flow of light. Photonic crystal structures in ion-sliced lithium niobate thin films These interesting properties were the basis of our motivation to fabricate photonic crystals in lithium niobate (LiNbO3) thin films and to investigate them. The aim of this work is to lay the groundwork for electro-optically tunable photonic crystals in ion-sliced LiNbO3 thin films.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.