Mr. Christian Nadell Profile

Christian Nadell

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Proceedings Article | 5 October 2015 Presentation

Metamaterial-based single pixel imaging system (Presentation Recording)

Willie Padilla, Claire Watts, Christian Nadell, John Montoya, Sanjay Krishna

Proceedings Volume 9544, 95441Q (2015) https://doi.org/10.1117/12.2189836

KEYWORDS: Spatial light modulators, Metamaterials, Modulation, Imaging systems, Cameras, Far infrared, Imaging devices, Detector arrays, Sensors, Liquid crystals

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Single pixel cameras are useful imaging devices where it is difficult or infeasible to fashion focal plan arrays. For example in the Far Infrared (FIR) it is difficult to perform imaging by conventional detector arrays, owing to the cost and size of such an array. The typical single pixel camera uses a spatial light modulator (SLM) - placed in the conjugate image plane – and is used to sample various portions of the image. The spatially modulated light emerging from the SLM is then sent to a single detector where the light is condensed with suitable optics for detection. Conventional SLMs are either based on liquid crystals or digital mirror devices. As such these devices are limited in modulation speeds of order 30 kHz. Further there is little control over the type of light that is modulated. We present metamaterial based spatial light modulators which provide the ability to digitally encode images – with various measurement matrix coefficients – thus permitting high speed and fidelity imaging capability. In particular we use the Hadamard matrix and related S-matrix to encode images for single pixel imaging. Metamaterials thus permit imaging in regimes of the electromagnetic spectrum where conventional SLMs are not available. Additionally, metamaterials offer several salient features that are not available with commercial SLMs. For example, metamaterials may be used to enable hyperspectral, polarimetric, and phase sensitive imaging. We present the theory and experimental results of single pixel imaging with digital metamaterials in the far infrared and highlight the future of this exciting field.

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