Research lines

The following research topics are addressed:

Laboratorio OpticaSpatial Light Modulators & Liquid Crystal Devices,

We develop reverse engineering techniques to derive physical models able to predict the modulation of liquid crystal modulators and spatial light modulators (SLM).

We work with different technologies like twisted nematic modulators, parallel aligned nematic modulators, and ferroelectric modulators.

 


CGHActive and Programmable Optics,

We apply SLMs to develop active optical elements based on their programmability and control from a computer. We develop computer controlled optical elements and systems.

As an example, see here a video demonstrating the real-time control of a laser beam: link

 


VBVector Beams and Spatially Variant Polarization Elements,

We develop techniques to generate, detect and analyze vector beams and spatially variant polarization elements.

We use either SLM based optical systems or liquid-crystal geometric phase optical elements such as q-plates, or specially designed diffraction gratings.

 


CGH2Diffractive Optics & Computer Generated Holograms,

We develop tools for the design, fabrication and evaluation of computer generated holograms (CGH), and digital diffractive optical elements (DOE).

We use iterative algorithms for the design of these elements. We generate detour-phase holograms, kinoform holograms, and geometrical-phase holograms.

 


INTERFERENCIASPolarimetry, Interferometry and Optical Sensing,

We apply SLMs and CGH for different techniques in polarimetry and interferometry, in order to develop optical sensing methods.

 

 


Slow & Fast Light - SmallSlow and Fast Light

We investigate novel schemes to propagate electromagnetic pulses with extremely small (slow light) or superluminal and even negative (fast light) group velocity. We develop theoretical models that are probed by performing experiments in the RF and MW range and through numerical simulations in the optical range. Slow and fast light effects have been thus demonstrated in multiple-beam interferometers and multilayer photonic structures which could be used in sensing applications. We also investigate group velocity control by means of liquid-crystal based devices.

 

Martes, 3 de diciembre de 2019