Ioannis D. Chremmos

Photonic microresonator research and applications

Fundamental Principles of Operation and Notes on Fabrication of Photonic Microresonators.- Circular Integrated Optical Microresonators: Analytical Methods and Computational Aspects.- Polarization Rotation in Ring Resonators.- Series-Coupled and Parallel-Coupled Add/Drop Filters and FSR Extension.- Advanced Microring Photonic Filter Design.- Band-Limited Microresonator Reflectors and Mirror Structures.- Slow and Stopped Light in Coupled Resonator Systems.- Processing Light in Reconfigurable Directly Coupled Ring Resonators.- Microresonators with Active Tuning.- Performance of Single and Coupled Microresonators in Photonic Switching Schemes.- Single Molecule Detection Using Optical Microcavities.- Microfiber and Microcoil Resonators and Resonant Sensors.- Photonic Crystal Ring Resonators and Ring Resonator Circuits.- High-Q Photonic Crystal Microcavities.- Radial Bragg Resonators.- Photonic Molecules and Spectral Engineering.- Fundamentals and Applications of Microsphere Resonator Circuits.- MEMS-Tuned Microresonators.- Microresonators for Communication and Signal Processing Applications.

Rigorous analysis of the coupling between two nonparallel optical fibers

The rigorous electromagnetic analysis of the coupling between two nonparallel optical-fiber waveguides is developed for the first time. Greens theorem, involving the dyadic Greens function of the fiber guiding the incident mode, is used to formulate the electric-field integral equation inside the second fiber. By applying the entire-domain Galerkin technique and by utilizing the generalized addition theorem for cylindrical waves for nonparallel axis translation, which is derived by the authors, this equation is analytically transformed into a system of coupled integral equations for the spectral weights of the field on the basis of TE and TM cylindrical vector wave functions. The Neumann-series iterative procedure is adopted to solve this system and obtain analytical expressions for the field scattering coefficients, which are sufficiently accurate for weakly coupled fibers

Suboscillations with arbitrary shape

We report a method for constructing bandpass functions that approximate a given analytic function with arbitrary accuracy over a finite interval. A corollary is that bandpass functions can be obtained that oscillate arbitrarily slower than their minimum frequency component, a counter-intuitive phenomenon known as suboscillations.