Guiding light by and beyond the total internal reflection mechanism

This thesis reports a series of techniques the author has developed to model various waveguiding structures, including the conventional planar and channel waveguides working by, and the advanced structures working beyond the TIR mechanism. Hence, this thesis contains both the methods and their applications to model and study the standard guided-wave and the advanced leaky-wave structures. The methods include mode solvers based on finite difference method (FDM) and finite element method (FEM), furnished with transparent boundary conditions (TBCs) for both guided and leaky modes. Based on the developed techniques, structures as simple as planar waveguides up to as complicated as photonic crystal fibers (PCFs) can be modeled rigorously

Enhancing the Performance of Integrated Optical Sensor by Slow-light: Theoretical Study on Ring-Resonator Based Structures

In this work, the performance of three kinds of integrated optical ring-resonator based slow-light structures for sensing applications is theoretically studied using the transfer matrix method and the complex transmission coefficient approach. Enhancement of sensing performance due to the slowlight phenomenon is quantitatively formulated. The modeling results show that using realistic structure parameters, a refractive index detection limit of one order better than the state of the art Mach-Zehnder interferometer sensing structure is possible by the inclusion of such a slow-light structure. The role of ring(s) attenuation constant in limiting the usable light slowness and the achievable sensor resolution is also discussed. For a sufficiently small ring attenuation constant, the optimal sensing performance of a single resonator circuit can be better than that of multiple resonator circuits, while offering less fabrication complexities, cleaner spectra, shorter device length, and higher figure of merit

Modeling of Multimodal Effects in Two-port Ring-Resonator Circuits for Sensing Applications

Multimodal effects in two-port ring-resonator circuits for sensing applications were modeled using a transfer matrix method and previously published rigorous 3-D modeling tools. Device parameters which are relevant for evaluating sensing performance are numerically deduced from the model. Some examples will be given.\u

Noise and resolution in IO interferometric sensing

The paper presents a general theory for sensing devices, relating noise and device parameters to resolution of modal index changes. The theory is applied to optimise the length of a few integrated optics sensing devices, being a Mac-Zehnder interferometers and two Fabry-Perot implementations. The results enable the determination of the maximum attainable resolution, and show the crucial importance of loss

Modes of an endlessly single-mode photonic crystal fiber: a finite element investigation

Using a finite-element mode solver, the modes of a commercial endlessly single-mode photonic crystal fiber (ESM-PCF) were investigated. Based on the loss discrimination between the dominant and the nearest higher order mode, we set-up a criterion for the single-modeness. Using that measure, we verified the single-modeness of the corresponding ESM-PCF and found that the endlessly single-modeness are valid only for relatively long fiber-length applications. Based on this, we suggest that ESM-PCF for short fiber-length applications should be designed differently from those for long fiber-length applications

PEMBENTUKAN KEPRIBADIAN MENTAL SPRITUAL GENERASI MILENIAL DI ZAMAN DIGITAL DITENGAH PANDEMI COVID 19

ABSTRAK Didalam dunia pendidikan tanpa hambatan adalah ini dibuat sebagai bahan pembelajaran tentang bagaimana cara membentuk kepribadian spiritual mental di kalangan milenial di zaman digital yan begitu cepat berkembang. Jadi dengan begitu  diharapkan bagi generasi meilenial ituharus mampu atau meningkatkan efikasi diri untuk memahami bagaimana cara dalam membentuk kepribadian mental spiritual di kalangan milenial pada zaman teknologi yang sudah semakin canggih ini. Jadi semoga dapat memberi informasi yang berguna bagi yang memahaminya, supaya dapat membentuk kepribadian spiritual di kalangan milenial di zaman digital apalagi di masa pandemic covid 19 yang sekarang ini memberi banyak dampak positif dan negative bagi seluruh dirinya sendiri, masyarakat manjemuk dan dunia. Oleh karena itu, mengharapkan agar ada suatu hal yang diberi atau masukkan yang bersifat membangun dari berbagai pihak,agar bisa menjadilebih baik lagi negerasi milenial. Kata kunci : kepribadian; spiritualitas; generasi milenia

Simple high-order Galerkin finite element scheme for the investigation of both guided and leaky modes in axially anisotropic planar waveguides

A simple high-order Galerkin finite element scheme is formulated to compute both the guided and leaky modes of anisotropic planar waveguides with diagonal permitivity tensor. Schemes up to 8th-order of accuracy in the effective index are demonstrated