We use a tight-binding formalism in the time domain to analyze the effect of resonant gain enhancement and spontaneous emission noise in amplifying coupled-resonator optical waveguides (CROWs). We find the net amplification of a wave propagating in a CROW does not always vary with the group velocity, and depends strongly on the termination and excitation of these structures. The signal-to-noise...

We present a filter design formalism for the synthesis of coupled-resonator optical waveguide (CROW) filters. This formalism leads to expressions and a methodology for deriving the coupling coefficients of CROWs for the desired filter responses and is based on coupled-mode theory as well as the recursive properties of the coupling matrix. The coupling coefficients are universal and can be appli...

We investigate the photonic properties of one dimensional photonic crystals realized on Silicon On Insulator channel slot-waveguide to engineer slow light effects. Various geometries of the photonic pattern have been characterized and their photonic band-gap structure analyzed. The optimal geometry has been further used to realize a coupled resonator optical waveguide (CROW). A first optimizati...

interesting questions related to a hot topic will eventually be revealed by somebody. Therefore, I try to study what other people do not. One thing I try to keep in mind is whether my questions are of general interest. My major interest lies in the underlying mechanism of seasonality. Because research on this topic requires a long time, few people want to work on this topic. I used quail as a m...

They made a big deal about those two birds. Apparently Betty and her mate were the subjects of a test to determine whether crows could learn how to extract meat from a test tube with a wire. The birds were presented with two wires, one straight and the other bent into a hook. The experiment did not last long. As soon as the crows learned that only the bent wire was effective, the dominant male ...

New research indicates that crows are capable of matching stimuli on the basis of analogical relations: that is, similarity of size, color and shape. This may be the first evidence for spontaneous analogical reasoning outside of the primate order.