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Synthesis, Modification, and Analysis of Silicate Cosmic Dust Analogues Using Ion-Beam Techniques

Description: Silicates analogous to cosmic dust were synthesized, modified, and analyzed utilizing ion-beam techniques with Rutherford backscattering spectrometry (RBS) and x-ray diffraction (XRD). Silicate dust is a common constituent in interstellar space, with an estimated 50% of dust produced in the stellar winds of M class Asymptotic Giant Branch (AGB) stars. Silicate dust acts as a surface upon which other chemicals may form (water ice for example), increasing significance in the cosmochemistry field,… more
Date: August 2020
Creator: Young, Joshua Michael
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Fabrication of Nano-Channel Templates and a Study of the Electrical and Magnetic Properties of Nanowires Grown in Template Pores

Description: This thesis is a study of the structural, electrical and magnetic properties of indium antimonide (InSb) nanowires (NWs), that were synthesized by a template-assisted ordered growth technique via electrochemical deposition. InSb was chosen for this study because of its intrinsic properties that make it a material of choice for applications in high channel mobility, infrared (IR) sensing, thermoelectrics, and magnetoresistive sensing martials. This work has four main components: (i) Growth in co… more
Date: May 2020
Creator: Singh, Abhay Pratap
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Investigation of Specialized Laser and Optical Techniques to Improve Precision Atomic Spectroscopy of Helium

Description: The aim of this thesis is to develop both Yb and Tm fiber laser sources with all fiber cavities. Both wavelength ranges provide useful laser sources for optical pumping of helium. The goal is to develop Tm laser sources operating at 2058 nm to optically quench 3He (2058.63 nm) and 4He (2058.69 nm) singlets (21S0). We also have developed Yb laser sources at 1083 nm to optical pump the triplet states of helium and laser cool an atomic beam of helium.
Date: May 2020
Creator: Currey, Ronnie
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries

Optical Property Study of 2D Graded Photonic Super-Crystals for Photon Management

Description: In this dissertation, we study the optical property of 2D graded photonic super-crystals (GPSCs) for photon management. We focused primarily on manipulation and control of light by using the newly discovered GPSCs which present great opportunity for electromagnetic wave control in photonic devices. The GPSC has been used to explore the superior capability of improving the light extraction efficiency of OLEDs. The enhancement of extraction efficiency has been explained in term of destructive int… more
Date: May 2020
Creator: Hassan, Safaa
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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