A Modified Single Defect Cavity Study for Coherent Coupling in Photonic Crystal VCSELs

A modified single defect cavity study was conducted to determine if a calibrated simplified model could be use to predict and subsequently design for coherent coupling in PhC VCSELs. Modeled and fabricated devices are compared

The Single-Angle Plane-Wave Spectral Response of One-Dimensional Photonic Crystal Structures

The multiple-incident-angle transmittances or reflectances of fabricated 1-D photonic crystal (PC) structures are measured. Regularization methods are applied to these measurements to determine the single-angle plane-wave spectral response of the structure

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Long-term analog-to-digital conversion development by short-term photonic crystal development

Issued as final repor

Optical single-angle plane-wave transmittances/reflectances from Schwarzschild objective variable-angle measurements

© 2004 American Institute of Physics. The electronic version of this article is the complete one and can be found at: http://dx.doi.org/10.1063/1.1641160DOI: 10.1063/1.1641160Photonic crystal structures and other nanoscale and microscale optical structures are centrally important to future device technology. The fundamental infrared single-angle plane-wave experimental characterization of these structures is needed to evaluate the analysis, design, and fabrication progress on these devices. The very small sizes of these devices necessitates focusing the infrared probe light typically with a Schwarzschild reflecting objective. The small spot size inherently requires the large range of incident angles associated with the objective. In this work, a variable-angle measurement method is presented for obtaining the optical single-angle plane-wave transmittances/reflectances. The primary steps in this method are (1) calculating the reference sample single-angle plane-wave transmittance/reflectance, (2) measuring the composite transmittances/reflectances of a reference sample over a range of objective angles of incidence, (3) calculating the intensity-angular-weighting coefficients for the objective using the Moore–Penrose (overdetermined linear equations) matrix inversion technique, (4) measuring the composite transmittances/reflectances of a sample-under-test over a range of objective angles of incidence, and (5) calculating the single-angle plane-wave transmittances/reflectances using the Moore–Penrose matrix inversion technique

Living with a trespasser: Riparian names and medieval settlement on the River Trent floodplain

The Trent is England's third longest river. Its propensity to flood has long been recognised. Indeed it is this distinguishing trait that appears to have given the river its name. In this paper, we examine how this mercurial and potentially dangerous river was understood and how its floodplain was settled in the Middle Ages. Drawing on toponomastic and palaeoecological evidence we examine the relationship between archaeologically attested medieval riparian settlements and the river. These themes are examined against the twin backgrounds of climate and anthropogenic landscape change which ensured that England's floodplains were some of the most dynamic, and thus complex, spaces in which medieval people chose to live