التفاصيل البيبلوغرافية
| العنوان: |
Silicon Carbide Phonon Polaritonic metasurfaces for an active control of mid-infrared light |
| المؤلفون: |
Kachiraju, Satya Rao |
| المساهمون: |
Grave-de-Peralta, Luis, Sanati, Mahdi, Bernussi, Ayrton, Kim, Sangsik, Chen, Aiping, Kim, Myoung-Hwan |
| سنة النشر: |
2022 |
| المجموعة: |
Texas Tech University: TTU DSpace Repository |
| مصطلحات موضوعية: |
Metasurfaces, Phonon Polaritonic Metasrufaces, Silicon Carbide, Active Control of Mid-Infrared Light, Reconfigurable Nanostructures, Vanadium Dioxide, SPP-SPhP Coupled Mode, Phase Transition Material, Fabry-Perot Nanocavity, SPhP Resonance, Active Control of SPhP Resonances, Active Metasurface |
| الوصف: |
The objective of this dissertation is to understand the near-field polaritonic interaction between mid-infrared surface waves and surface polarized ion oscillations confined in subwavelength-scale metasurfaces and to the further development of tunable and reconfigurable surface polaritonic metasurfaces for dynamic control of mid-infrared surface waves. Optical metasurfaces have been used to demonstrate a wavefront control of light in free space and optical waveguides by imposing spatially varying optical responses to the light. However, controlling light localized and propagating on the surface has been challenging because the surface waves scatter intensively to the metallic metasurfaces causing optical power loss. In this thesis work, we chose silicon carbide (SiC), one of the standard polar dielectrics in mid-infrared, as an emerging metasurface platform showing low optical power loss and high coupling efficiency to the light. Here, we propose and experimentally demonstrate passive and active resonant nanocavities that enhance the absorption spectrum and dynamically control the resonance frequency. The passive device is designed with the subwavelength-scale (≈ λ0/150) resonant nanocavity arrays enhance the device's absorption spectrum in the mid-infrared (10 – 12 microns) via excitation of coupled surface plasmon-phonon polaritons. The proposed metal-insulator-polar dielectric (gold-silicon-silicon carbide) structure supports a guided mode of the coupled surface polaritons in the lateral direction while vertically confining the mid-infrared wave within the 80 nm thick dielectric spacer. In particular, 0/10 scale metal-insulator gratings are imposed to form Fabry-Pérot cavity arrays displaying angle-insensitive and frequency-tunable absorption of up to 80% of the optical power in the mid-infrared. We have fabricated resonant optical nanocavity with gold-silicon multilayer grating structures on 6H-Silicon for different cavity widths. We measured the strong and well-defined absorption spectrum via excitation of ... |
| نوع الوثيقة: |
doctoral or postdoctoral thesis |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| العلاقة: |
https://hdl.handle.net/2346/90154Test |
| الإتاحة: |
https://hdl.handle.net/2346/90154Test |
| حقوق: |
Restricted to TTU community only. |
| رقم الانضمام: |
edsbas.CDA20F65 |
| قاعدة البيانات: |
BASE |
