Tailoring light with a digital micromirror device

Ren, Yu-Xuan; Lu, Rengui; Gong, Lei

doi:10.1002/andp.201500111

Cited by 186 publications

(102 citation statements)

References 107 publications

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“…The creation of the SAB is implemented through an amplitude digital micromirror device (DMD). 24,25 The advantage of the DMD is its ability to present the diffractive patterns with a considerably fast speed. 26 Full control over the phase and the amplitude is achieved through binary Lee hologram.…”

Section: Introductionmentioning

confidence: 99%

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Fang

Ren

Gong

et al. 2015

Journal of Applied Physics

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Needle-like electromagnetic field has various advantages for the applications in high-resolution imaging, Raman spectroscopy, as well as long-distance optical transportation. The realization of such field often requires high numerical aperture (NA) objective lens and the transmission masks. We demonstrate an ultralong needle-like focus in the optical range produced with an ordinary lens. This is achieved by focusing a symmetric Airy beam (SAB) generated via binary spectral modulation with a digital micromirror device. Such amplitude modulation technique is able to shape traditional Airy beams, SABs, as well as the dynamic transition modes between the one-dimensional and two-dimensional (2D) symmetric Airy modes. The created 2D SAB was characterized through measurement of the propagating fields with one of the four main lobes blocked by an opaque mask. The 2D SAB was verified to exhibit self-healing property against propagation with the obstructed major lobe reconstructed after a certain distance. We further produced an elongated focal line by concentrating the SAB via lenses with different NAs and achieved an ultralong longitudinal needle focus. The produced long needle focus will be applied in optical, chemical, and biological sciences.

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Section: Introductionmentioning

confidence: 99%

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Fang

Ren

Gong

et al. 2015

Journal of Applied Physics

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“…They have been used for beam shaping, [1][2][3][4][5][6][7] computational imaging, 8,9 the design of compact high-dynamic range cameras 10,11 and numerous other areas of research where manipulation of the spatial distribution of light is beneficial such as polarization, 12 pulse shaping. 13 The application explored here utilizes an SLM as a Fourier plane filter.…”

Section: Introductionmentioning

confidence: 99%

Enhanced optical alignment of a digital micro mirror device through Bayesian adaptive exploration

2017

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As the use of Digital Micro Mirror Devices (DMDs) becomes more prevalent in optics research, the ability to precisely locate the Fourier “footprint” of an image beam at the Fourier plane becomes a pressing need. In this approach, Bayesian adaptive exploration techniques were employed to characterize the size and position of the beam on a DMD located at the Fourier plane. It couples a Bayesian inference engine with an inquiry engine to implement the search. The inquiry engine explores the DMD by engaging mirrors and recording light intensity values based on the maximization of the expected information gain. Using the data collected from this exploration, the Bayesian inference engine updates the posterior probability describing the beam’s characteristics. The process is iterated until the beam is located to within the desired precision. This methodology not only locates the center and radius of the beam with remarkable precision but accomplishes the task in far less time than a brute force search. The employed approach has applications to system alignment for both Fourier processing and coded aperture design.

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“…The DMD is a microelectromechanical system with millions of switchable mirrors as pixels [36,37]. Each pixel can be moved to on or off states by inclining them to either 12 +° or 12 -° with respect to the surface normal.…”

Section: Introductionmentioning

confidence: 99%

Assessing digital micromirror devices for speckle noise control in digital holography

Gaviria-Mesa¹,

Hincapie²,

Garcı́a-Sucerquia³

et al. 2017

Opt. Pura Apl.

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ABSTRACT:Speckle noise is a common issue in coherent imaging techniques. As one of these techniques, digital holography (DH) is affected by this problem. Although several attempts have been made to overcome speckle noise in the numerical reconstruction of digitally recorded holograms, there still exists the need for fast and effective methods to get rid of speckle and improve image quality. We assess the suitability of a digital micromirror device (DMD) as modulator of the object illumination in a digital holographic setup, where the DMD acts generating speckle-like patterns that are projected onto the object. These patterns change the object beam in a random way. Several holograms, each with a different pattern in the object illumination, are recorded and numerically reconstructed. The image with reduced speckle noise is the result of a superposition in an intensity basis of various such reconstructions. The feasibility of the method is validated by experimental results.Key words: Digital holography; Speckle; Digital Micromirror Device RESUMEN:El ruido speckle es un problema inherente a las técnicas de formación de imágenes con luz coherente. Ya que la holografía digital es una de estas técnicas, también se ve afectada por este problema. Aunque se han hecho varios intentos por eliminar el ruido speckle en la reconstrucción numérica de hologramas registrados digitalmente, todavía existe la necesidad de métodos rápidos y efectivos para eliminar el speckle y mejorar la calidad de las imágenes reconstruidas. Nosotros evaluamos la conveniencia del uso de un dispositivo digital de microespejos (DMD) como modulador de la iluminación del objeto en un montaje holográfico digital. El DMD actúa generando patrones aleatorios tipo speckle que son proyectados sobre el objeto. Estos patrones cambian el haz objeto de una manera aleatoria y después interfiere formando el holograma. Se registran varios hologramas, cada uno con un patrón diferente en la iluminación del objeto, y se reconstruyen numéricamente. La imagen final con el ruido speckle reducido es el resultado de la superposición en intensidades de varias de estas reconstrucciones. La viabilidad del método es validada mediante resultados experimentales. [28] X. Cai and H. Wang, "The influence of hologram aperture on speckle noise in the reconstructed image of digital holography and its reduction", Opt. Commun. 281, 232-237 (2008).

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Tailoring light with a digital micromirror device

Cited by 186 publications

References 107 publications

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Enhanced optical alignment of a digital micro mirror device through Bayesian adaptive exploration

Assessing digital micromirror devices for speckle noise control in digital holography

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