We propose a highly efficient compact sensor that is based on Bragg gratings. The high efficiency represent the coupling power to the grating waveguide. We achieved high coupling efficiency approaching 50% with relatively small dimensions. The design is characterized by its easy fabrication techniques due to the reliable dimensions, this in turn can help in having it being integrated with other electronic components on the same chip. Also, this coupler has the potential to be used as a chemical sensor.

In this paper, we present the analysis and design of an efficient analyte sensor based on Surface Plasmon Resonance. These analytes can be used as biomarkers to detect molecules that lie in mid-infrared. This sensor is based on an array of plasmonic nanoantennas of highly doped Germanium on Silicon Substrate. The proposed plasmonic nanoantenna is CMOS compatible and designed to detect and amplify the molecular absorption lines of a condensed phase analyte called Polydimethylsiloxane. Furthermore, the proposed design demonstrate field enhancement in order up to 20 times of the input signal which leads to detect the fingerprint of different substances with high efficiency and paves the way to integrate for Lab-on-chip applications.

In this paper, we present a novel design of an adiabatic compact taper which can be used as a converter between a grating coupler and a single-mode optical fiber at 1550 nm wavelength. The proposed taper in this paper is coupling the light between a wide grating coupler with width 15µ and nanophotonic waveguide with width 500nm. Besides, the length of the proposed design is 22µm. Therefore, it is a compact design as it has a small footprint which leads to high efficiency and low costs in fabrication. The coupling efficiency is around 92%.

Low-emissivity glazing reduces heat transfer, but its continuous fluorine-doped tin oxide (FTO) coating attenuates wireless signals. A two-scale coating-budget framework treats coating removal as a cost to minimize inside the patterned window and over the whole pane. A laboratory insulating-glass unit of commercial K-Glass was laser-patterned over a 50 mm × 50 mm window on both cavity-facing surfaces with hexagonal-ring and square-patch arrays. The coating was modeled as a lossy sheet (design sheet resistance 17 Ω/sq; measured 12.4 ± 0.2 Ω/sq). Full-wave simulation predicts an intrinsic 0.7–6 GHz passband with ≈1.5 dB mean insertion loss, reproduced by a fitted equivalent-circuit model to 0.37 dB. Angular modeling keeps the passband to 40° for both polarizations (transverse-electric loss up to ≈3.5 dB); oblique incidence was not measured. Single-mounting free-space measurements show ≈15 dB mean transmission recovery over 1–6 GHz relative to the unpatterned unit; an independent campaign gives ≈19 dB at 2.4 GHz. Inside the patterned window, 47% of the coating is removed, yet 98.3% of the front-pane and 99.1% of the rear-pane coating remain on the 300 mm × 300 mm panes (98.7% combined). Area-averaged estimates bound the per-pane visible-transmittance change to 1.7 percentage points and emissivity rise to 0.012; neither was measured.