• Adjustable-field background suppression sensor detects objects within a defined sensing field, while ignoring objects located beyond the sensing field cutoff • Two-turn, logarithmic adjustment of sensing field cutoff point from 0.2 m to 1 m (7.9 in to 3.3 ft); allows easy setting of cutoff point at long range • Rotating pointer indicates relative cutoff point setting • Easy push-button or rem...

A novel cationic water-soluble conjugated polyelectrolyte (CPE) of polyfluorene that contains 15% fraction of 2,1,3-benzothiadiazole (BT) units (PFC3NBT) has been obtained. PFC3NBT demonstrates intramolecular energy transfer from the fluorene segments to BT sites when negatively charged species (SDS or DNAs) are added, following by a shift in emission color from blue to green, has been develope...

We report 'broadband light-sensing' all-polymer phototransistors with the nanostructured bulk heterojunction (BHJ) layers of visible (VIS) light-sensing electron-donating (p-type) polymer and near infrared (NIR) light-sensing electron-accepting (n-type) polymer. Poly[{2,5-bis-(2-ethylhexyl)-3,6-bis-(thien-2-yl)-pyrrolo[3,4-c]pyrrole-1,4-diyl}-co-{2,2'-(2,1,3-benzothiadiazole)]-5,5'-diyl}] (PEHT...

We report an electrochemical DNA microarray sensor whose function is controlled with just two wires regardless of the number of individual sensing electrodes. The bipolar sensing electrode is modified with probe DNA, and the anode end of each electrode is configured to emit light (electrogenerated chemiluminescence) upon hybridization of cDNA labeled with electrocatalytic (oxygen reduction) Pt ...

Light to frequency converters are used to sense the photocurrents of a buried triplejunction pixel achieving high dynamic range and low dark current colour sensing without the use of colour filters. The pixel is realised in a high voltage 0.35μm CMOS enabling sample manipulation by electrowetting and spectral sensing for a FRET biosensor.

We demonstrate a polymer resonator microfluidic biosensor that overcomes the complex manufacturing procedures required to fabricate traditional devices. In this new format, we show that a gapless light coupling photonic configuration, fabricated in SU8 polymer, can achieve high sensitivity, label-free chemical sensing in solution and high sensitivity biological sensing, at visible wavelengths.

Position sensing photodiodes are detectors that provide quantitative information about the position of an incident light beam or spot image. There are currently two technologies that offer this functionality: multi-element photodiodes and position sensing (or lateral displacement) photodiodes. This article reviews the construction and operation of both types, discusses key considerations for op...

Optical microfibers possess excellent optical and mechanical properties that have been exploited for sensing. We highlight the authors' recent work in the areas of current, temperature, acceleration, acoustic, humidity and ultraviolet-light sensing based on this exquisite technology, and the advantages and challenges of using optical microfibers are discussed.

A cost-effective, highly compact, and versatile optoelectronic device constructed of two ordinary light emitting diodes compatible with optosensing films has been developed. This fibreless device containing chemoreceptor, semiconductor light source, and detector integrated in a miniaturized flow-through cell of low microliter internal volume works as a complete photometric chemical sensor suita...

Theoretical investigations on the enhancement of integrated optical sensor performance by utilizing the slow-light phenomenon are presented. For this study, we take a sensor consisting of a Mach-Zehnder Interferometer (MZI) [1] layout, which employs ring-resonator-based coupled-resonator optical waveguides (CROWs) slow-light structures in both the sensing and reference arms. The waveguides are ...