We propose a silicon Fabry–Perot planar waveguide modulator structure consisting of two Bragg reflectors to form the cavity. The Bragg reflectors are nanoscale trenches in the waveguide fabricated using electron beam lithography and reactive ion etching. Compared to conventional waveguide modulator designs, large modulation depth can be achieved with much smaller modulator length using high-fin...

Light confinement strategies in thin film silicon solar cells play a crucial role in the performance of the devices. In this work, the possible use of Ag coated stamped polymers as reflectors to be used in n-i-p solar cells is studied. Different random roughnesses (nanometer and micrometer size) have been transferred on poly(methylmethacrylate) (PMMA) by hot embossing. Morphological and optical...

∗ We introduce a model to design reflectors that take into account the inverse-square law for radiation, i.e. it considers how far the reflector is from the source. The radiant intensity at the source and the irradiance distribution at the target are given. We prove the existence of solutions in the near field case, when the input and output energies are prescribed. A uniqueness property will a...

Continuity along reflectors in seismic images is used via Curvelet representation to stabilize the convolution operator inversion. The Curvelet transform is a new multiscale transform that provides sparse representations for images that comprise smooth objects separated by piece-wise smooth discontinuities (e.g. seismic images). Our iterative Curvelet-regularized deconvolution algorithm combine...

Grading the refractive index period of a rugate is a technique for depositing broad band reflectors using rugate technology. The principle advantage of this technique is the ability to deposit long and short pass reflectors in parallel with other rugate spectral features and thus generate complex performance in a single optical film. Variation of the amplitude of the index profile as the period...

In this paper, we present a distributed approach to detecting a type of distributed denial of service attack known as reflector attacks. In our approach, every potential reflector monitors the incoming packets and broadcasts a warning message to other potential reflectors if any abnormal traffic is observed. The warning message contains a description of the abnormal traffic it has observed. A d...