Optimization of liquid crystal displays behavior in optical image processing and in diffractive optics

In this paper we will revise the application of twisted nematic liquid crystal displays (TN-LCD) as spatial light modulators (SLM) for image processing and diffractive optics. In general two kind of responses are desired for the mentioned applications: amplitude-only and phase-only modulation. In ge...

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Detalles Bibliográficos
Autores principales: Campos, J., Márquez, A., Nicolás, J., Moreno, I., Iemmi, C., Escalera, J.C., Davis, J.A., Yzuel, M.J., Refregier P., Javidi B., Ferreira C., Vallmitjana S.
Formato: CONF
Materias:
Amplitude-only modulation
Correlation
Diffractive optical elements
Liquid crystal displays
Optical pattern recognition
Phase-only modulation
Programmable apodizers
Spatial light modulators
Amplitude modulation
Diffractive optics
Eigenvalues and eigenfunctions
Image analysis
Light modulation
Light polarization
Light transmission
Mathematical models
Nematic liquid crystals
Optical character recognition
Optical correlation
Optical filters
Optimization
Phase modulation
Quantum optics
Reverse engineering
Correlation methods
Density (optical)
Geometrical optics
Image processing
Information systems
Light
Liquids
Modulation
Optical data processing
Optical properties
Pattern recognition
Optical image processing
Light modulators
Apodizers
Intensity measurements
Physical parameters
Twisted nematic-liquid crystal displays
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0277786X_v81CR_n_p335_Campos
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:In this paper we will revise the application of twisted nematic liquid crystal displays (TN-LCD) as spatial light modulators (SLM) for image processing and diffractive optics. In general two kind of responses are desired for the mentioned applications: amplitude-only and phase-only modulation. In general the users of commercially available LCDs do not know the optical properties of the used material. Thus, a reverse-engineering approach is needed to optimize the LCD response. First, we show a simplified model, that we recently proposed, for the orientation of the LC molecules. The model allows the determination of the physical parameters of the LCD by means of simple intensity measurements. Second, we demonstrate the capability of the model to provide very accurate predictions of the optical transmission. Therefore, we can perform computer searches for the optimum orientation of the added polarizing elements to obtain the required optical transmission. We demonstrate the need to insert wave plates in front and behind the LCD to obtain either amplitude-only or phase-only regimes with the LCD. Finally, we show the application of the optimized LCD to display images and filters in optical image processing, as well as we show the design of diffractive optical elements and apodizers.

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