Tailoring Thermal Emissivity with Polariton-Epsilon-Near-Zero Strong Coupling in Polar Semiconductor-based Metamaterials
Abstract
Task 1: Polariton-ENZ Hybridization for Control of Polariton Dispersion (18 months)Subtask 1.1: Grow and characterize a series of f"ive CdO layers, with carrier densities ranging from nominally undoped to highly dopedSubtask 1.2: Extract the experimental dielectr"ic function of these five CdO filmsSubtask 1.3: Grow a series of 3-4 ENZ-SPP bilayer metamaterials with constant ENZ thickness and" doping, but with varying SPP carrier density at a fixed SPP thickness.Subtask 1.4: Grow a series of 3-4 ENZ-SPP bilayer metamateri""als with constant SPP layer thickness and carrier density, but with varying ENZ thicknessSubtask 1.5: Grow 3 SPP-ENZ layers as in s""ubtask 1.3, but with reversed growth orderSubtask 1.6: Grow 3 SPP-ENZ layers as in subtask 1.4, but with reversed growth orderSubt"ask 1.7: Characterize the polaritionic dispersion for each of the samples Subtask 1.8: Characterize the polaritonic evanescent decay for each of the samples Subtask 1.9: Develop the necessary electromagnetic modeling using CST Studio~ and COMSOL Multiphysics~ for each of the metamaterial sample designs and experimentsTask 2: Role of Polariton Confinement and Characterization of Thermal Emission Spectra (12 months)Subtask 2.1: Develop the processes for nanoscale lithography of the CdO layered films to create nanostruct"ures.Subtask 2.2: Use models to identify optimal designs for nanostructures to be used to quantify the propagation length, the impa""ct of the strength of the ENZ-SPP coupling, and angle-dependence of thermal emission.Subtask 2.3: Fabricate periodic arrays of cubo"idal or cylindrical nanostructures with varying sizesSubtask 2.4: Fabricate periodic arrays of rectangular nanostructures of ENZ-SP"P and SPP-ENZ films with rectangle widths held constant, but varying lengths Subtask 2.5: Characterize the IR resonances via reflec""tion, transmission and absorption spectra of the nanostructures Subtask 2.6: Characterize the temperature dependence of the IR ther"mal emission spectra from the nanostructures Subtask 2.7: Characterize the angle dependence of the IR thermal emission spectra at a" fixed, elevated temperatureTask 3: Designing Spatial Coherence (12 months)Subtask 3.1: Grow 3, 5 and 7 layer CdO SPP/ENZ metamat"erial samples.Subtask 3.2: Characterize the angle-dependent and temperature dependent thermal emission from samples grown in subtask 3.1.Subtask 3.3: Design nanostructure array patterns to enable focused and directed emission profiles.Subtask 3.4: Fabricate a nanostructure array pattern for inducing thermal emission focusingSubtask 3.5: Fabricate 3-4 samples with a defined periodicity to demonstrate how the SPP-ENZ coupling induces thermal emission dispersion.Subtask 3.6: Characterize the samples fabricated in subtasks 3.4 and 3.5 as a function of angle to quantify the focusing and/or angular diffraction as a function of carrier density.Subtask 3".7: Use the results from subtask 3.6 to identify the feasibility of active tuning of the spatial dispersion, ENZ-SPP coupling streng"th and operational frequency via carrier injection.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 23, 2018
- Source ID
- N000141812107
Entities
People
- Joshua Caldwell
Organizations
- Office of Naval Research
- United States Navy
- Vanderbilt University