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Retarders are chemical admixtures designed to extend the setting time, which is especially useful when there is a delay in sequential concrete pours to prevent cold joints and to achieve a cohesive structure. Retarders, when used in appropriate amounts, can also enhance the architectural appearance of exposed aggregate finishes.
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Optical retarder system with programmable spectral retardance.

Ignacio Moreno, José V Carrión, José Luis Martínez

|November 1, 2014

Summary

A novel optical system uses a liquid crystal on silicon (LCoS) spatial light modulator (SLM) to create programmable retarder waveplates. This technology allows for dynamic control over spectral retardance, enabling new applications in polarization control and light spectrum generation.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Traditional waveplates offer fixed retardance, limiting their adaptability in dynamic optical systems.
Controlling spectral retardance programmably is crucial for advanced optical applications.

Purpose of the Study:

To propose and demonstrate an optical system for programmable spectral retardance using a spatial light modulator.
To showcase the system's capability in generating programmable polarization spectra and light spectra.

Main Methods:

Utilizing a pixelated liquid crystal on silicon (LCoS) spatial light modulator (SLM).
Spectrally dispersing input light and projecting different wavelengths onto distinct SLM pixels.
Addressing wavelength-specific retardance for each pixel and recombining the reflected light.

Main Results:

Successful implementation of a programmable retarder waveplate with dynamic spectral retardance control.
Demonstration of spectral compensation for constant retardance and creation of abrupt spectral retardance functions.
Exhibition of bandpass variable retarder filters and programmable light spectrum generation.

Conclusions:

The LCoS-SLM based system offers a versatile platform for programmable polarization and spectral control.
This technology opens avenues for advanced optical filtering, compensation, and light shaping applications.