Effect of extended defects on photoluminescence of gallium oxide and aluminum gallium oxide epitaxial films.

In this work, a systematic photoluminescence (PL) study on three series of gallium oxide/aluminum gallium oxide films and bulk single crystals is performed including comparing doping, epitaxial substrates, and aluminum concentration. It is observed that blue/green emission intensity strongly correlates with extended structural defects rather than the point defects frequently assumed. Bulk crystals or Si-doped films homoepitaxially grown on (010) β-GaO yield an intense dominant UV emission, while samples with extended structural defects, such as gallium oxide films grown on either (-201) β-GaO or sapphire, as well as thick aluminum gallium oxide films grown on either (010) β-GaO or sapphire, all show a very broad PL spectrum with intense dominant blue/green emission.

Impact of fabrication errors and refractive index on multilevel diffractive lens performance.

Multilevel diffractive lenses (MDLs) have emerged as an alternative to both conventional diffractive optical elements (DOEs) and metalenses for applications ranging from imaging to holographic and immersive displays. Recent work has shown that by harnessing structural parametric optimization of DOEs, one can design MDLs to enable multiple functionalities like achromaticity, depth of focus, wide-angle imaging, etc. with great ease in fabrication.

Group e-mentoring: a new approach to recruitment into nursing.

In an effort to interest young people in the nursing profession, a unique approach merging mentoring with electronic communications was developed. This program, Group Electronic Mentoring in Nursing (GEM-Nursing), aims to educate and motivate young people, ages 15-21, to consider the nursing profession as their career choice. It links students with volunteer nurse mentors across the country via e-mail and a Web site (www.