Dual wavelength digital holographic Laplacian reconstruction

Ryle, James P.; Li, Dayan; Sheridan, John T.

doi:10.1364/ol.35.003018

Cited by 20 publications

(8 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous works, the two-dimensional Laplace operator has been implemented using holograms [38,39] and phase-shifted Bragg grating [40]. These implementations either rely upon bulky optical components, or operate in reflection modes.…”

Section: Discussionmentioning

confidence: 99%

A Photonic Crystal Slab Laplace Differentiator

Guo¹,

Xiao

Minkov

et al. 2018

Conference on Lasers and Electro-Optics

View full text Add to dashboard Cite

We introduce an implementation of a Laplace differentiator based on a photonic crystal slab that operates at transmission mode. We show that the Laplace differentiator can be implemented provided that the guided resonances near the Γ point exhibit an isotropic band structure. Such a device may facilitate nanophotonics-based optical analog computing for image processing.This document provides supplementary information to "A Photonic Crystal Slab Laplace Differentiator". This supplementary document consists of four sections. In Section 1, we derive the effective Hamiltonian near the Γ point, when the states are two-fold degenerate at the Γ point. In Section 2 we provide numerical validation of the effective Hamiltonian. In Section 3, we calculate the transmission for an arbitrary polarized state from the transmission response for S and P polarized light. In Section 4, we plot the transmittance |t| in a larger wavevector region for the device configuration that operates as a differentiator. Such information on transmittance is used in demonstrating the performance of the differentiator.

show abstract

Section: Discussionmentioning

confidence: 99%

A Photonic Crystal Slab Laplace Differentiator

Guo¹,

Xiao

Minkov

et al. 2018

Conference on Lasers and Electro-Optics

View full text Add to dashboard Cite

show abstract

“…For example, multiple views of the same object could be stored into one hologram. It should be noted that spatial multiplexing using color has appeared in the literature for both digital holography [207], [308] and quantitative phase retrieval [404], [405], [406], [229], so the concept is not necessarily novel but still useful.…”

Section: Digital Multiplexing Holographymentioning

confidence: 99%

Computational imaging and automated identification for aqueous environments

Loomis¹

2011

View full text Add to dashboard Cite

Sampling the vast volumes of the ocean requires tools capable of observing from a distance while retaining detail necessary for biology and ecology, ideal for optical methods. Algorithms that work with existing SeaBED AUV imagery are developed, including habitat classi…cation with bag-of-words models and multi-stage boosting for rock…sh detection. Methods for extracting images of …sh from videos of longline operations are demonstrated.A prototype digital holographic imaging device is designed and tested for quantitative in situ microscale imaging. Theory to support the device is developed, including particle noise and the e¤ects of motion. A Wigner-domain model provides optimal settings and optical limits for spherical and planar holographic references.Algorithms to extract the information from real-world digital holograms are created. Focus metrics are discussed, including a novel focus detector using local Zernike moments. Two methods for estimating lateral positions of objects in holograms without reconstruction are presented by extending a summation kernel to spherical references and using a local frequency signature from a Riesz transform. A new metric for quickly estimating object depths without reconstruction is proposed and tested. An example application, quantifying oil droplet size distributions in an underwater plume, demonstrates the e¢ cacy of the prototype and algorithms. Course work at MIT and WHOI was helpful throughout this thesis. In particular, course materials and projects from Dr. Antonio Torralba (computer vision, detection, and boosting), Dr. Frédo Durand (computational imaging, segmentation, and probability), Dr. Rosalind Picard (machine learning, pattern recognition, and probability), Dr. Alan 4 Edelman (parallel computing and algorithms), and Dr. Barbastathis (optical systems) are re ‡ected directly, in several cases extended after the course to become complete sections of this thesis.The MIT Museum has provided unique outreach opportunities for the ideas presented in this thesis. Seth Riskin originally involved our lab in holography activities at the MIT Museum, then Kurt Hasselbalch later proposed and guided the development of an interactive display on plankton holography. The computational approaches I learned for the museum display led to further scienti…c development and spurred the use of GPUs for processing; Section 3.3.5 is a direct consequence, as is the majority of the data processing performed throughout this thesis.In reference to data processing, Matlab/MEX and NVIDIA's CUDA have been daily cornerstones for which I am continually thankful. Finally, mad props go to Dr. José "Pepe" Domínguez-Caballero, the most in ‡uential 5 person in my scienti…c development while at MIT. Pepe taught me digital holography and worked one-on-one with me throughout the beginning of my grad student career. He continued to be involved as a fellow holographer, a mentor, and a friend, discussing ideas, encouraging active experimentation, maintaining a curiosity about optics, and o¤ering eno...

show abstract

“…Most of the issues have resulted in recent publications , but my discussion will primarily involve the recent work presented in [26][27][28][29][30][31][32]. I wish to emphasis the importance of treating optical system as systems which must be analysed and designed in their totality.…”

Section: Introductionmentioning

confidence: 99%

“…Some of the applications examined by my group include metrology systems [2][3][4][5][6]25], and optical encryption [18][19][20][21][22][23][24]31]. The work has included significant experimental work with speckle based and holographic systems [4][5][6][7][8][9][10][11]32].…”

Section: Introductionmentioning

confidence: 99%