<p>Metasurfaces are broadly defined as
artificially engineered material interfaces that have the ability to
determinately control the amplitude and phase signatures of an incident
electromagnetic wave. Subwavelength sized optical scatterers employed at the
planar interface of two media, introduce abrupt modifications to impinged light
characteristics. Arbitrary engineering of the optical interactions and the
arrangement of the scatterers on plane, enable ultra-compact, miniaturized
optical systems with a wide array of applications (e.g. nanoscale and nonlinear
optics, sensing, detection, energy harvesting, information processing and so
on) realizable by the metasurfaces. However, maturation from the laboratory to
industry scale realistic systems remain largely elusive despite the expanding
reach and vast domains of functionalities demonstrated by researchers. A large
part of this multi-faceted problem stems from the practical constraints posed
by the commonly used plasmonic materials that limit their applicability in
devices requiring high temperature stability, robustness in varying ambient,
mechanical durability, stable growth into nanoscale films, CMOS process
compatibility, stable bio-compatibility, and so on. </p>
<p>Aiming to create a
whole-some solution, my research has focused on developing novel,
high-performance, functional plasmonic metasurface devices that utilize the
inherent benefits of various emerging and alternative material platforms. Among
these, the two-dimensional MXenes and the refractory transition metal nitrides
are of particular importance. By exploiting the plasmonic response of thin films of the titanium carbide
MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) in the near infrared spectral
window, a highly broadband metamaterial absorber has been designed, fabricated
and experimentally demonstrated. In another work, high efficiency photonic spin
Hall Effect has been experimentally realized in robust phase gradient
metasurface devices based on two different refractory transition metal nitrides
–titanium nitride (TiN) and zirconium nitride (ZrN). Further, taking advantage
of the refractory nature of these plasmonic nitrides, a metasurface based temperature
sensor has been developed that is capable of remote, optical sensing of very
high temperatures ranging up to 1200<sup>o</sup>C.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/8291885 |
| Date | 02 August 2019 |
| Creators | Krishnakali Chaudhuri (6787016) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/Plasmonic_Metasurfaces_Utilizing_Emerging_Material_Platforms/8291885 |
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