Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Numerical design of a silicon nitride nanobeam cavity for biochemical sensing(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-12-08) Rosero Arias, Cristian; De León Arizpe, Israel; puemcuervo/tolmquevedo; Castañón Ávila, Gerardo Antonio; López Aguayo, Servando; School of Engineering and Sciences; Campus MonterreyThe field of integrated photonics has experienced rapid growth in the past few decades. Sensors based on photonic crystal (PhC) nanobeam cavities are of great interest due to their size , sensing capabilities, and possible applications such as biochemical sensing. Silicon Nitride (SiN) platforms are competitive option against its counterpart Silicon due to the cost of material, no loss due to Two-Photon Absorption (TPA) or Free Carrier Absorption (FCA), and wide transparency window in both visible and near-infrared regions of the spectrum. Nevertheless, SiN presents low refractive index contrasts, which makes it challenging to achieve optical field confinement inside the cavity. Previous work have proven that slow light waveguides can compensate the low refractive index (RI) contrast in order to obtain high $\mathcal{Q}$ cavities. This thesis presents a design of a slow light PhC nanobeam cavitiy based on SiN working at near-infrared range. A numerical analysis was performed using a high-Q deterministic design. The proposed nanobeam cavity consists of a slow-light PhC waveguide bounded by two Bragg mirrors. For biochemical sensing purposes, the cavity is designed such that the optical mode supported has most of the field in the medium around it, thereby increasing the light-matter interaction between the cavity mode and the analyte. The sensing performance of the structure was studied by RI sensing analysis. The cavity designs presents a Q factor up to $\sim1.2\times10^{4}$ at a wavelength $\sim$ 900 nm. The bulk sensitivity and FOM were found at 215 nm/RIU and 2843, respectively.
- Numerical and experimental analysis of a polarization-sensitive plasmonic diffractive metasurface for directional coupling of optical waves(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2021-10-01) Mousavi, SeyedehNiousha; De León Arizpe, Israel; puelquio/tolmquevedo; López Mago, Dorilián; Hernández Aranda, Raúl Ignacio; School of Engineering and Sciences; Campus MonterreyAdvanced applications in nanophotonics demand precise and effective control over optical fields. For this purpose, a variety of complex plasmonic nanostructures have been designed. While these nanostructures satisfy the need for controlling the directionality of surface plasmons, they are limited as propagation in different directions requires re-fabrication of such nanostructures. Therefore, developing a plasmonic metasurface to allow directional coupling to surface plasmons in a dynamic manner, through controlling the polarization state of the incident light, could overcome this limitation. The main objective of this thesis is to study the near-field interference of lattice plasmon modes with dipolar and quadrupolar nature as a mechanism to have dynamic directional coupling over a broad spectral range. The aim is to dynamically control propagation direction of surface plasmons by using the polarization degrees of freedom and to be able to tune the power in opposite directions with different ratios over a broad range of wavelengths. The results presented in this thesis may have impact on future fundamental and applied plasmonics research field. The diffraction-assisted directionality of the split ring resonator metasurface could hold potential for applications in various polarization-selective couplers such as circular-polarization beam splitters and tunable polarization spectral filters.
- Modelling of the intensity-dependent refraction of conductive oxide thin-films with near-zero-permittivity through a nonlinear transfer matrix approach(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-11) Pérez Casanova, Adriana; De León Arizpe, Israel; emipsanchez/tolmquevedo; López Aguayo, Servando; Hernández Aranda, Raúl; School of Engineering and Sciences; Campus MonterreyThis thesis is intended to contribute to the analytical understanding of intensity-dependent refraction in homogeneous thin layers of transparent conductive oxides in the frequency region where the real part of the relative permittivity vanishes. The motivation for this investigation is the extraordinarily large and ultra-fast optical nonlinearity displayed by transparent conductive oxides in the near-zero permittivity region which turn them into a promising base material of new photonic devices. In order to achieve this goal, a simplified numerical model has been developed for studying the behaviour of the intensity-dependent refractive index, under steady state conditions, in homogeneous, one-dimensional layered systems of TCOs. The numerical model is based on an adaptation of the Nonlinear Transfer Matrix Method that enables the method to obtain the refractive index values as a function of local intensity values inside the material. The most important capability of this model is the ability to accurately relate experimentally acquired measurements with the material's microscopic properties as long as local saturation effects remain negligible.