Banca de QUALIFICAÇÃO: JEDSON FERNANDES DE AMORIM

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : JEDSON FERNANDES DE AMORIM
DATE: 27/08/2025
TIME: 14:30
LOCAL: Plataforma Google Meet
TITLE:

Investigation of Embedded Graphene and Defects in Cylindrical Photonic Quasicrystals

KEY WORDS:

Cylindrical Photonic Quasicrystals. Transmittance. Absorption. Transfer-
Matrix Method. Double–Period. Oldenburger-Kolakoski. Central Defects. Toluene.

 

PAGES: 41
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

In this work, we use the transfer matrix method is used to calculate the transmission and absorption spectra of obliquely
incident TE and TM waves. In the first part, graphene sheets are inserted between planar and concentric layers of TiO2 and SiO2,
arranged according to the aperiodic Oldenburger-Kolakoski (O-K) sequence. The numerical results reveal that the transmission
spectra for cylindrical geometry differ significantly from those for planar geometry, even in the case of a normal incidence angle.
Furthermore, TM modes show higher transmission than TE modes for incidence angles greater than 30°. A substantial number
of peaks in the absorption spectra for the cylindrical case are higher than those for the planar case. The second part of this work,
we investigate the temperature-dependent optical behavior of cylindrical photonic quasicrystals (CPQs) incorporating a central
defect layer composed of toluene – a material with a refractive index sensitive to both wavelength and temperature. The structure
follows a double-period sequence. We explore how temperature variations affect transmission spectra, emphasizing performance
metrics such as full width at half maximum (FWHM), sensitivity (S), and quality factor (Q). The results revealed that the
resonance peak sharpness and spectral sensitivity increase with difference of temperature, and angle of incidence.

 

COMMITTEE MEMBERS:
Presidente - 1519258 - DORY HELIO AIRES DE LIMA ANSELMO
Interno - 1354851 - MANOEL SILVA DE VASCONCELOS
Externo à Instituição - VAMBERTO DIAS DE MELLO - UERN