Multilayer photonic platforms require flat, high-quality intermediate cladding layers. We developed a bilayer hydrogen silsesquioxane (HSQ) contact-planarization process that works for silicon etch depths of…
Combining broadband achromatic focusing with a wide field of view is a long-standing challenge for metalenses. Starting from a quadratic phase profile and applying dispersion…
A tutorial on inverse design for photonic integrated devices, covering the fundamental concepts behind both iterative optimization and machine-learning approaches. Using the design of an…
Surface-grating antennas for optical phased arrays usually show a strongly polarization-dependent emission angle and efficiency. Exploiting a subwavelength metamaterial on silicon-on-insulator, we demonstrate a compact…
Silicon nitride offers low propagation losses and a wide transparency range, making it attractive for quantum photonics, but its low birefringence makes polarization control difficult.…
We experimentally demonstrate a silicon photonic optical phased array with a two-dimensional matrix of antennas optimized to emit light over a large fraction of the…
Mode exchangers are key building blocks for on-chip mode-division multiplexing. Combining subwavelength grating metamaterials with symmetric Y-junctions, we demonstrate a 6.5 µm × 2.6 µm…
Fabrication uncertainties strongly affect the performance of photonic devices but are often overlooked during design. We combine unsupervised dimensionality reduction and Gaussian process regression for…
There is an ubiquitous problem that everyone designing, testing, and using integrated photonic devices has to face: how to efficiently get the light in and…
In this paper we tackle a problem that is frequent to many disciplines and is getting more and more common also in photonics: the need…