D
David Lowell
Researcher at University of North Texas
Publications - 23
Citations - 200
David Lowell is an academic researcher from University of North Texas. The author has contributed to research in topics: Photonics & Photonic crystal. The author has an hindex of 8, co-authored 23 publications receiving 158 citations.
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Holographic fabrication of graded photonic super-crystals using an integrated spatial light modulator and reflective optical element laser projection system
TL;DR: In this paper, a hybrid laser projection system with a spatial light modulator and a single reflective optical element was proposed for the holographic fabrication of graded photonic super-crystals.
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Holographic fabrication of 3D photonic crystals through interference of multi-beams with 4 + 1, 5 + 1 and 6 + 1 configurations
David George,Jeffrey Lutkenhaus,David Lowell,Mojtaba Moazzezi,Murthada Adewole,Usha Philipose,Hualiang Zhang,Zsolt L. Poole,Kevin P. Chen,Yuankun Lin +9 more
TL;DR: A good agreement has been observed between fabricated holographic structures and simulated interference patterns, and these optical elements have been used to fabricate 3D photonic crystals with 4, 5 or 6-fold symmetry.
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Simultaneous direct holographic fabrication of photonic cavity and graded photonic lattice with dual periodicity, dual basis, and dual symmetry
TL;DR: This paper demonstrates the digital, holographic fabrication of graded, super-basis photonic lattices with dual periodicity, dual basis, and dual symmetry in a programmable spatial light modulator for direct imaging of graded photonic super-lattices.
Journal ArticleDOI
Holographic fabrication of graded photonic super-quasi-crystals with multiple-level gradients.
David Lowell,Safaa Hassan,Oliver Sale,Murthada Adewole,Noah Hurley,Usha Philipose,Banglin Chen,Yuankun Lin +7 more
TL;DR: This paper presents the holographic fabrication of graded photonic super-quasi-crystals through pixel-by-pixel phase pattern engineering using a spatial light modulator and observed the golden ratio in the diameters of the diffraction rings of the fabricated quasi-crystal, indicating five-fold symmetry.
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Electrically tunable diffraction efficiency from gratings in Al-doped ZnO
David George,Li Li,David Lowell,Jun Ding,Jingbiao Cui,Hualiang Zhang,Usha Philipose,Yuankun Lin +7 more
TL;DR: In this paper, a continuous electrical tuning of diffraction efficiency from transparent conducting aluminum-doped zinc oxide (AZO) gratings in the visible range (specifically 532 nm) when the AZO is under bias voltages between −1