Aperiodic multilayer graphene based tunable and switchable thermal emitter at mid-infrared frequencies

Abstract

for the continuous support of my thesis. I would like to thank Dr. Georgios Veronis for his comments, patience, motivation, and immense knowledge. His guidance and attention to detail helped me in all the time of research and this thesis could not have been written without his supervision. I am truly indebted to Jon for his meticulous comments and encouragements, as well as his innovative approach to develop and widen my research from various perspectives. Not only a great mentor, he has been a true father whose kindness will forever be of immense value to me. I could not have imagined having better advisors and mentors for my M.Sc. study than Dr. Georgios Veronis and Dr. Jonathan P. Dowling. My sincere thanks also go to Dr. Theda Daniels-Race for her insightful comments and suggestions to improve the quality of my research. Last but not the least, I would like to thank my lovely husband for supporting me spiritually throughout my study and my life in general. Without a doubt, this accomplishment would have never been possible without his continuous support, unconditional love, and prayers. iv

Advanced mid-infrared lightsources above and beyond lasers and their analytical utility

“…As a result, they showed that the p-polarization of the thermal radiation, which is close to the ENZ frequency (central wavelength at ~ 6.25 µm) has stronger emissivity than for the s-polarization (central wavelength at ~ 9 µm). In contrast, Sharifi et al [49] proposed an aperiodic structure consisting of a graphene/hexagonal-boron-nitride (hBN; insulator) multilayer sandwiched between thick SiC layers on a tungsten substrate. By applying a DC electric field perpendicular to the graphene/hBN surfaces, they have varied the chemical potential in the range of 0-1 eV of graphene and thus optimized the selectivity, tunability and switching ability of the thermal radiation of the multilayer structure for 8, 13, 23, 28 and 32 graphene layers for a central wavelength of ~ 3.34 µm.…”

Design of microresonators to minimize thermal noise below the standard quantum limit

“…27, while the number of pairs is decreased to 22. The thick GaAs layer deposited over the InGaP buffer layer is removed and the last two layers are optimized by our recently developed hybrid optimization algorithm [37] consisting of a micro-genetic global optimization algorithm coupled to a local optimization algorithm [38]. Our goal is to obtain structures with thinner GaAs/Al0.92Ga0.08As pairs while the transmission of 250 parts per million (p.p.m.)…”

Broadband and Wide-Temperature-Range Thermal Emitter with Super-Hydrophobicity Based on Oxidized High-Entropy Film

“…14,15 A perfect thermal emitter requires a broadband emission spectrum, and its thermal emission ability is strongly dependent on the structure and materials. 16 There are a lot of state-of-the-art works on designing of perfect thermal emitters. Shi et al 17 realized a broadband thermal emission with average emittance that is more than 70% by using a hexagonal boron nitride encapsulated graphene filament.…”

“…Blackbody radiation follows Planck’s law that the emission profile is related to the wavelength of electromagnetic radiation and shifts with temperature. , Thermal emitters based on the blackbody radiation are widely used but not limited in applications of energy generation (thermophotovoltaic devices − and thermoelectric devices − ), radiative cooling, , sensing, , and spectroscopy. , A perfect thermal emitter requires a broadband emission spectrum, and its thermal emission ability is strongly dependent on the structure and materials . There are a lot of state-of-the-art works on designing of perfect thermal emitters.…”