Research Projects

Below are some examples of current CfM projects.

Active Metamaterials
We propose to explore this riich area of fundamental research of metamaterial, which is characteristically defined by its active composition of the host material. Here by active we refer to the material properties that exhibit either optical gain under pumping or strong material nonlinear properties or both.
 
Active Metasurfaces
Recently, metamaterials researchers have developed novel metallic feature structures, metasurfaces, that allow for local control of the phase as an optical beam is transmitted through a surface. The objectives of this project are to investigate these metasurfaces using a low cost, rapid development approach to increase the efficiency of the refraction, develop designs that allow for pixilated arrays of flat lens, and investigate tuning concepts that would allow for the steering of microwave and infrared beams.
 
Metasurface Design
The goal of this project is to develop and validate a design tool for bulk metamaterials that takes into account coupling effects between nanostructures. It is based on a building block of resonators for each nano-structure referenced in a database to compile the desired design structure.
 
Design and Fabrication of Low-Loss Low-Index Optical Metamaterials
A new and rigorous theory (Ramm) that goes well beyond well known mixing rules (e.g. Maxwell-Garnett and Bruggeman) has been used to predict specific particle properties that would lead to a composite metamaterial having a desired refractive index, such as less than unity. Modeling based on this method and the development of processes and procedures to make and characterize coated nanoparticles is in progress.
 
THz Metamaterials
We have recently discovered that THz form-birefringence can be induced in sub-wavelength structures
fabricated from methacrylates using stereolithographic fabrication. These exciting results provide a new avenue for the fabrication of highly anisotropic THz metamaterials and their use for THz sensing and imaging applications.
 
IR Mueller Matrix Imaging of Dielectric Metamaterials
Recent advances in three-dimensional laser direct writing (3D-DLW) now enable the fabrication of dielectric metamaterials composed of constituents with virtually arbitrary geometry at the nanometer scale. However, despite these advances in nanoscale fabrication, the characterization and analysis of such metamaterials in the infrared spectral range is still lacking. In this project we will use variable angle of incidence ellipsometry and near normal incidence ellipsometry to characterize infrared metamaterials composed of subwavelength dielectric structures.
 
OAM Fiber
This project builds upon our work on generating, detecting and sorting OAM modes. In this project, we take what we have learned in past projects, combined with knowledge in the field of fiber gratings and aim to develop a fiber grating that filters for OAM mode.
 
Sorting Uniquely Identical Spherical Resonators by Light Forces
We will develop and exploit a disruptive technology of sorting microspheres with extraordinary high level of
uniformity of their whispering gallery mode (WGM) resonances. The proposed method is based on previous work done in the center showing that a focused laser beam exerts optical force on microspheres transversing the beam. 
 

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