Angular and spatial light modulation by single digital micromirror device for multi-image output and nearly-doubled étendue

The "Angular Spatial Light Modulator" (ASLM) achieves simultaneous angular and spatial light modulation at a plane by combining Digital Micromirror Device (DMD) based programmable blazed grating beam steering and binary pattern sequencing. The ASLM system multiplies the number of effective output pixels of the DMD for increased spatial and/or angular degrees of freedom, and nearly-doubles the etendue output of the DMD. We implement multiple illumination and projection schemes to demonstrate ASLM-based extended FOV display, light-field projection, and multi-view display. We also implement time-multiplexed pupil segmented illumination to extend the pattern steering to two dimensions. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing AgreementUniversity of Arizona; Department of Defense (DoD) National Defense Science and Engineering Graduate (NDSEG); Air Force Research Laboratory (AFRL); ARCS FoundationOpen access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

Bandgaps and antiresonances in integrated-ARROWs and Bragg fibers; a simple model

We consider the spectral properties of dielectric waveguides with low refractive index cores and binary layered claddings, such as Bragg fibers and integrated-ARROWs. We show that the full, nontrivial, 2-D spectrum of Bloch bands (hence bandgaps) of such claddings correspond, in structure and topology, to the dispersion properties of both constituent layer types; quantitatively demonstrating an intimate relationship between the bandgap and antiresonance guidance mechanisms. The dispersion functions of these layers, and the interactions thereof, thus form what we coin the Stratified Planar Anti-Resonant Reflecting OpticalWaveguide (SPARROW) model, capable of quantitative, analytic, descriptions of many nontrivial bandgap and antiresonance properties. The SPARROW model is useful for the spectral analysis and design of Bragg fibers and integrated-ARROWs with cores of arbitrary refractive index (equal to or less than the lowest cladding index). Both waveguide types are of interest for sensing and microfluidic applications due to their natural ability to guide light within low-index cores, permitting low-loss guidance within a large range of gases and liquids. A liquid-core Bragg fiber is discussed as an example, demonstrating the applicability of the SPARROW model to realistic and important waveguide designs.Kristopher J. Rowland, Shahraam Afshar V. and Tanya M. Monr

Investigation on the Use of trapping in the Management of the Banana Weevil, Cosmopolites Sordidus (Germar)(Coleoptera: Curculionidae) in Mauritius

The banana weevil, Cosmopilites sordidus (Germar) is an important pest of banana in Mauritius. At present, control of C.sordidus is achieved by soil treatment with insecticides by growers. No research has been conducted to understand the pest abundance and develop alternative methods to better manage C. Sordidus with minimum use of insecticides. In this 11-month study, the potential of two trap types (pseudostem and pheromone traps) to lure weevils in banana fields was determined at three different ecological sites (Clemencia, Nouvelle France and Rivière du Poste). The effect of treatment of pseudostem trap with insecticides (Imidachloprid, Cyfluthrin and Lambda-Cyhalothrin) was evaluated under field condition. The damage level in fields at Clamencia and Rivière du Poste was also determined. The pseudostem and pheromone traps were effective in luring banana weevils. The average number of weevil caught per week in pseudostem and pheromone traps were 2.03 and 5.92 respectively. Relatively more adults were caught at Nouvelle France. This indicates that weevils were in higher numbers in the super humid site (Nouvelle France) compared to humid Rivière du Poste and dry (Clemencia) sites. Pseudostem treated with Imidachloprid was more effective than the other two insecticides. Damage by C. Sordidus ranged from 15.5% to 31% at Clemencia and Rivière du Poste. Pseudostem and pheromone traps can be used for monitoring and mass trapping of C.Sordidus. A better weevil management can be easily achieved by the use of either pseudostem or pheromone traps and proper timing of soil drenching. This will, no doubt greatly reduce insecticide application in banana field.Keywords: Banana, Cosmopolites sordidus, pseudostem and pheromone traps, insecticides, mass trappin

Mating behaviour of an undescribed species of Coccophagus, near C gurneyi (Hymenoptera: Aphelinidae)

Volume: 6Start Page: 92End Page: 9

Ecological disjunction across the sexes in an alloparasitoid: Host requirements, sex ratios and mate localization (Hymenoptera: Aphelinidae)

The larval females of Coccophagus sp. nr gurneyi Compere are primary parasitoids of lantana mealybugs, whereas males develop hyperparasitically through other parasitoids (never their own females), so the species is alloparasitic. Males are seldom even reared from lantana mealybugs

Development and Implementation of Integrated Pest Management in Mauritius: an overview

No Abstrac