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.
- Numerical modelling of a nanoplasmonic biosensor based on a Mach-Zehnder interferometer(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-06-03) Félix Rendón, Ulises; De León Arizpe, Israel; lagdtorre/tolmquevedo; Martínez Chapa, Sergio Omar; Hernández Aranda, Raúl Ignacio; School of Engineering and Sciences; Campus MonterreyIn the last few decades, optical biosensors based on surface plasmon resonance (SPR) have attracted increasing attention as a label-free alternative for the detection of small traces of biological and chemical markers, for application ranging from drug discovery and medical diagnosis to food quality and national defense. These approaches exploit the high sensitivity of surface plasmons polaritons (SPPs) to variations in the refractive index of the medium surrounding a thin metal film, which is caused by adsorption of the analyte molecules in the metal-dielectric interface. However, nowadays the plasmonic biosensor platforms with best performance require of complex optical configurations and bulky instrumentation, which difficult its miniaturization capability and portability, limiting its integration with other bioanalytical tools. In this work, we propose a novel design based on a Mach-Zehnder interferometer (MZI), consisting on a gold layer with a subwavelength aperture surrounded by grooves, and a detection system based on intensity interrogation. Our proposed architecture contemplates independent control of the reference and sensing arms in a planar disposition, which allows the biosensor to operate in the region of maximum sensitivity for low-analyte concentration and avoid the requirement of using complex multilayer fabrication techniques. Through numerical simulations using the FDTD-method, we found that our platform performed satisfactorily compared to previously reported designs. Moreover, its miniaturization potential, small footprint, and simple illumination scheme make it an ideal candidate for use in integrated sensing systems, which can be further enhanced by multiplexing.