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The "Achilles heels" of optical beams in imaging (and other) applications are attenuation, obscuration, scattering, and diffraction, limiting the penetration depth of applicability due to distortion, attenuation and/or widening of the optical beam.
Nondiffracting beams are partially resilient to almost all of them, but still are strongly affected by attenuation. Such shaped optical beams have rapidly grown in recent years from abstract curiosities to taking a major role in imaging. These beams appear to defy diffraction and in light sheet fluorescence microscopy can lead to increases in resolution and field-of-view.
We have proposed and demonstrated diffractive light delivery control by using compensating beams for in fluorescence imaging, based on modified non-diffractive beams, keeping the light peak intensity under safe levels for reduce photo-toxicity while keeping an uniform generated signal.
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[click on the heading for more info]Credit: Optical manipulation group, and Aston Institute of Photonic Technologies.
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Computational imaging refers to the enhancement of the capabilities of an imaging system by the application of computational techniques, as an alternative to increasing the optical setup complexity.
In the Imaging Concepts Group, we have explore different computational imaging techniques:
- Computational super-resolution
- Integral / light field imaging
- Computational multi-spectral imaging
- Glare-free retinal imaging by computational illumination
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[click on the heading for more info]Credit: Imaging Concepts Group
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Ultrafast optical processing of light achieve operations at speeds several orders higher than in electronics due to the huge ~ THz bandwidth of optical systems and signals.
In my previous research I have explored and originally proposed some basic building blocks for ultra-fast processors of optical pulses based on linear photonic resonant structures, such as Bragg gratings and optical cavities structures.
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[click on the heading for more info]Credit: Aston Institute of Photonic Technologies and UPM Departamento de Tecnología Fotónica y Bioingeniería.
Fast spatial light modulators based on digital micromirror devices enables the modulation of light at kHz speeds. By making the most of the DLP technology originally developed for modern commercial projectors, scrambled light in "messy" media propagation can be "re-arranged". We demonstrated focus and polarization control, by optimum correction (fastest possible) based on a novel media characterization method, applied to a few-modes fiber.
Credit: Optical manipulation group
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