Programmable Optics with Liquid Crystal Active functions
Abstract
In this project we want to perform an initial exploration of new possibilities for active optical functions with liquid crystals on silicon photonics. In particular, we want to maximally leverage the unique optical and electro-optic properties of liquid crystals in terms of polarization, anisotropy and optical nonlinearities. Up to today, demonstrations of liquid crystal capabilities in combination with waveguides have been small-scale, and not very convincing to enable novel functions on large photonic circuits. The functions we want to realize include high-efficiency (low loss, compact, low voltage) phase shifters for tuning photonic circuits, high-speed modulators based on the Pockels effect, and non-reciprocal devices. We will approach this exploration on two fronts- materials and geometries. We will look at liquid crystal mixtures with a very high anisotropy, which can give rise to very efficient electro-optic phase shifts. Some liquid crystals also exhibit a strong Pockels effect, and we want to leverage this to demonstrate high-speed electro-optic modulation. As a very speculative exploration, we will also look into liquid crystals with magneto-optic properties, with the goal of demonstrating nonreciprocal transmission (e.g. to make an optical isolator). The second exploration is on the geometry side, developing shaped waveguide geometries and electrodes in silicon to maximize the interaction between the liquid crystal and the optical mode, and at the same time maximize the electric field over the liquid crystal. These will be fabricated using a combination of commercially available silicon photonics platforms (IMEC) and e-beam fabrication in the Ghent University clean room.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 22, 2024
- Source ID
- FA86552317072
Entities
People
- Wim Bogaerts
Organizations
- Air Force Office of Scientific Research
- Ghent University
- United States Air Force