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Paris, France

Arwin H.,Linkoping University | Magnusson R.,Linkoping University | Garcia-Caurel E.,Ecole Polytechnique - Palaiseau | Fallet C.,Bioaxial | And 4 more authors.
Optics Express | Year: 2015

Spectral Mueller matrices measured at multiple angles of incidence as well as Mueller matrix images are recorded on the exoskeletons (cuticles) of the scarab beetles Cetonia aurata and Chrysina argenteola. Cetonia aurata is green whereas Chrysina argenteola is gold-colored. When illuminated with natural (unpolarized) light, both species reflect left-handed and near-circularly polarized light originating from helicoidal structures in their cuticles. These structures are referred to as circular Bragg reflectors. For both species the Mueller matrices are found to be nondiagonal depolarizers. The matrices are Cloude decomposed to a sum of non-depolarizing matrices and it is found that the cuticle optical response, in a first approximation can be described as a sum of Mueller matrices from an ideal mirror and an ideal circular polarizer with relative weights determined by the eigenvalues of the covariance matrices of the measured Mueller matrices. The spectral and image decompositions are consistent with each other. A regression-based decomposition of the spectral and image Mueller matrices is also presented whereby the basic optical components are assumed to be a mirror and a circular polarizer as suggested by the Cloude decomposition. The advantage with a regression decomposition compared to a Cloude decomposition is its better stability as the matrices in the decomposition are determined a priori. The origin of the depolarizing features are discussed but from present data it is not possible to conclude whether the two major components, the mirror and the circular polarizer are laterally separated in domains in the cuticle or if the depolarization originates from the intrinsic properties of the helicoidal structure. © 2015 Optical Society of America. Source


Alvarez I.,University of Oviedo | Enguita J.M.,University of Oviedo | Menendez B.H.,University of Oviedo | Garcia R.,University of Oviedo | Sirat G.Y.,Bioaxial
Journal of Optics (United Kingdom) | Year: 2015

Conical diffraction is an interesting phenomenon that occurs in biaxial crystals. Although the existence of this conical diffraction has been understood for a very long time, it was not until recently that the first applications started to appear, and most of them focus on the manipulation of laser beams. However, the potential use of conical diffraction for all-optical processing in full-scene imaging devices was never addressed. In this article we present a prototype of a general-purpose optical device in order to investigate the applicability of conical diffraction to full-scene imaging. We also show that conical diffraction can obtain the derivative of an image with high resolution. This is the first proof of the theoretical capabilities of conical diffraction in full scenes, and it is just one of its many applications in the field of machine vision. © 2015 IOP Publishing Ltd. Source


Trademark
Bioaxial | Date: 2014-05-28

Scientific apparatus and instruments, namely microscopes, data processing apparatus, mathematical instruments and lasers not for medical use; optical apparatus and instruments, namely diffraction apparatus, polarimeters and refractors; apparatus and instruments for measuring, namely measuring apparatus and precision measuring apparatus; data processing equipment; software (recorded programs), namely software for the acquisition and processing of images; diagnostic apparatus not for medical use. Evaluation and estimation in the fields of science and technology provided by engineers; scientific and technical research; design and development of software; technical project study; development (design), installation, maintenance, updating or rental of software; design of computer systems, namely design of systems for acquiring and processing of images; server hosting, namely hosting of computer servers.


Trademark
Bioaxial | Date: 2014-05-28

Scientific apparatus and instruments, namely microscopes, data processing apparatus, mathematical instruments and lasers not for medical use; optical apparatus and instruments, namely diffraction apparatus, polarimeters and refractors; apparatus and instruments for measuring, namely measuring apparatus and precision measuring apparatus; data processing equipment; software (recorded programs), namely software for the acquisition and processing of images; diagnostic apparatus not for medical use. Evaluation and estimation in the fields of science and technology provided by engineers; scientific and technical research; design and development of software; technical project study; development (design), installation, maintenance, updating or rental of software; design of computer systems, namely design of systems for acquiring and processing of images; server hosting, namely hosting of computer servers.


Patent
Bioaxial | Date: 2013-04-11

The invention relates to an optical measurement method and to an optical measurement device for determining the spatial or spatiotemporal distribution of a sample, the sample comprising at least one retransmission source, said at least one retransmission source retransmitting light depending on the projected light, according to a predetermined law, onto the sample, the method comprising: the projection onto the sample of at least two compact light distributions belonging to different topological families, which propagate along the same optical path, the detection of the light retransmitted by said at least one retransmission source of the sample; the generation of at least one optical image from the detected light; and the algorithmic analysis of the optical images for obtaining location data on said at least one retransmission source.

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