Ptychography for optical metrology with limited translation knowledge

Moore, Dustin B.; Fienup, James R.

doi:10.1364/ao.55.004596

Cited by 14 publications

(4 citation statements)

References 42 publications

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“…Only when the image plane coincides perfectly with the aperture plane is the specimen reconstruction in focus, otherwise a computational propagation is needed after the reconstruction to bring the specimen to focus. Because this setup compresses the specimen information into a 2D complex wave, it is very useful when the 3D scattering inside the specimen renders the multiplicative approximation on which the other methods rely inaccurate – an example of this is optical metrology for contact lenses or optics characterisation (Moore & Fienup, ).…”

Section: Discussionmentioning

confidence: 99%

Ten implementations of ptychography

Maiden

2017

Journal of Microscopy

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Ptychography is an increasingly popular phase retrieval imaging technique, able to routinely deliver quantitative phase images with extended field of view at diffraction limited resolution. Different variants of this technique, like Bragg ptychography and Fourier ptychography, have also been developed and applied to various fields. Here we experimentally demonstrate 10 ways to implement the conventional real space transmission ptychography, and compare their properties to provide a guide to choosing the optimal setup for a specific application.

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Section: Discussionmentioning

confidence: 99%

Ten implementations of ptychography

Maiden

2017

Journal of Microscopy

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“…and J.R.F.) extended the TTD method with a bootstrapping approach [35][36] . This method allows the bounding aperture, the linear phase contributing to each PSF, and details of the movement of the subaperture between images to be determined during wavefront-sensing analysis of the image data.…”

Section: Nircam Coronagraphic Module Wavefront-error Trendingmentioning

confidence: 99%

Wavefront-error performance characterization for the James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) science instruments

et al. 2016

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The science instruments (SIs) comprising the James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) were tested in three cryogenic-vacuum test campaigns in the NASA Goddard Space Flight Center (GSFC)'s Space Environment Simulator (SES) test chamber.In this paper, we describe the results of optical wavefront-error performance characterization of the SIs. The wavefront error is determined using image-based wavefront sensing, and the primary data used by this process are focus sweeps, a series of images recorded by the instrument under test in its as-used configuration, in which the focal plane is systematically changed from one image to the next. High-precision determination of the wavefront error also requires several sources of secondary data, including 1) spectrum, apodization, and wavefront-error characterization of the optical ground-support equipment (OGSE) illumination module, called the OTE Simulator (OSIM), 2) f/# and pupil-distortion measurements made using a pseudo-nonredundant mask (PNRM), and 3) pupil geometry predictions as a function of SI and field point, which are complicated because of a tricontagon-shaped outer perimeter and small holes that appear in the exit pupil due to the way that different light sources are injected into the optical path by the OGSE. One set of wavefront-error tests, for the coronagraphic channel of the Near-Infrared Camera (NIRCam) Longwave instruments, was performed using data from transverse translation diversity sweeps instead of focus sweeps, in which a sub-aperture is translated and/or rotated across the exit pupil of the system.Several optical-performance requirements that were verified during this ISIM-level testing are levied on the uncertainties of various wavefront-error-related quantities rather than on the wavefront errors themselves. This paper also describes the methodology, based on Monte Carlo simulations of the wavefront-sensing analysis of focus-sweep data, used to establish the uncertainties of the wavefront-error maps.

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“…Ptychography, a promising coherent diffractive imaging technique, has been extensively investigated in disciplines as diverse as microscopy [1][2][3], three-dimensional imaging [4], and optical metrology [5,6]. Recently, ptychography-based optical security has aroused keen interest in researchers [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Semi-symmetric cryptosystem for complex-valued object via single-shot ptychography and random modulus decomposition

Wang

et al. 2018

J. Opt.

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A semi-symmetric optical cryptosystem for a complex-valued object via single-shot ptychography (SSP) and random modulus decomposition (RMD) is proposed. The decryption keys are not thoroughly identical to the encryption keys in this semi-symmetric cryptosystem. Owing to the complementarity between SSP and RMD, the proposed cryptosystem is able to encrypt the complex-valued object and resist the brute-force attack simultaneously. The structural fault tolerance ensures the high experimental feasibility of the cryptosystem. Meanwhile, the large key space and the destruction of partial encryption keys enable the cryptosystem to be robust against various attacks, including brute-force attack and iterative-algorithm attack. Further, several security-enhanced methods are proposed. Opto-digital experiments have been performed to verify the effectiveness of the proposed cryptosystem. Semi-symmetric cryptosystems will surely bring profound illumination to the field of optical security.

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Ptychography for optical metrology with limited translation knowledge

Cited by 14 publications

References 42 publications

Ten implementations of ptychography

Ten implementations of ptychography

Wavefront-error performance characterization for the James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) science instruments

Semi-symmetric cryptosystem for complex-valued object via single-shot ptychography and random modulus decomposition

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