22 citations · 77 across the 6 of their papers we have counts for
6 papers
High-Efficiency Multilevel Phase Lenses with Nanostructures on Polyimide Membranes
Leslie Howe, Tharindu D. Rajapaksha, Kalani H. Ellepola +7
The emergence of planar meta-lenses on flexible materials has profoundly impacted the long-standing perception of diffractive optics. Despite their advantages, these lenses still f…
Effect of High-k Dielectric Layer on 1/f Noise Behavior in Graphene Field-Effect Transistors
Yifei Wang, Vinh X. Ho, Zachary. N. Henschel +2
We report the 1/f noise characteristics at low-frequency in graphene field-effect transistors that utilized a high-k dielectric tantalum oxide encapsulated layer (a few nanometers…
Observation of Optical Gain in Er-Doped GaN Epilayers
V. X. Ho, Y. Wang, B. Ryan +4
Rare-earth based lasing action in GaN semiconductor at the telecommunication wavelength of 1.5 micron has been demonstrated at room temperature. We have reported the stimulated emi…
Room-temperature lasing action in GaN quantum wells in the infrared 1.5 micron region
V. X. Ho, T. M. Al tahtamouni, H. X. Jiang +3
Large-scale optoelectronics integration is strongly limited by the lack of efficient light sources, which could be integrated with the silicon complementary metal-oxide-semiconduct…
Monte Carlo Ray-Trace Diffraction Based On the Huygens-Fresnel Principle
J. R. Mahan, N. Q. Vinh, V. X. Ho +1
The goal of this effort is to establish the conditions and limits under which the Huygens-Fresnel principle accurately describes diffraction in the Monte Carlo ray-trace environmen…
Photoluminescence quantum efficiency of Er optical centers in GaN epilayers
V. X. Ho, T. V. Dao, H. X. Jiang +4
We report the quantum efficiency of photoluminescence processes of Er optical centers as well as the thermal quenching mechanism in GaN epilayers prepared by metal-organic chemical…