Posts categorized Optical

Cadmium selenide nanoplatelets (a two-dimensional variant of the quantum dot) are increasingly used in optical devices due to their bright and tunable emission characteristics.

However, to use these colloidal particles in practical photonic devices, the direct patterning of micron-scale features remains a grand-challenge.

Using thin-film fabrication and UV lithography tools inside the URnano cleanroom, we have been able to direct-write nanoplatelet patterns inside Fabry-Perot cavities with features as small as one micron, and show strong light-matter coupling with greater Rabi splitting than typically seen in this geometry due to stronger lateral electric field confinement.

The capability to create arbitrary patterns in nanoplatelet films will enable the fabrication of chiral meta-structures which opens up the possibility to observe and study chiral strong light-matter coupling and exciton-polariton photo-physics.

This project investigates a classical nonlinear interferometer designed to mimic the halved fringe spacing of N00N state quantum interferometry.

Our project concentrates on using PlanOpSim’s optimization algorithm software to enhance the efficiency and functionality of nanostructured optical devices. Unlike traditional engineering methods, in which a structure is designed and then tested, inverse design begins with a target optical response and uses computational methods to determine the optimal nanostructure to achieve that function. For our first objective, we designed a metasurface capable of displaying two distinct holographic images depending on whether the incident light is in the TE or TM polarization state. For the second, we aimed to design a metasurface that produces specific colors by controlling the interaction of light with carefully engineered nanostructures.

We created model retinas for fundus imaging, which simulate several parts of the retina.

The low numerical aperture multimode fiber project is a detailed fiber design and simulation developed by a team of undergraduate senior students. As such, the inputs were determined through discussion with our project customer, ASML. We are designing a fiber to support ASML’s YieldStar (YS) optics sensor for scanning wafers using white light with the wavelength range of 400 to 1000 nm and another fiber to operate at a wavelength of 1070 nm meant to preheat a mirror for a separate lithography machine.