Photonic-Based Time-Resolved Multipulse Oxygen Sensor

Gas Sensor Based on Large Hollow-Core Photonic Bandgap Fiber

One concern in using photonic band-gap fiber (PBGF) as a gas sensor is the response time. In this type of the gas sensors, response time is the time required for gas to diffuse into the hollow-core. So considering a large hollow-core PBGF (HC-PBGF), the response time can be significantly reduced. But in the large HC-PBGF, the fundamental issue is the presence of higher order modes (HOMs). Somet...

Refractometric Sensor Based on Silicon Photonic Wires

Integrated optical (IO) refractometric sensors have particularly interesting applications in label-free biosensing and in measuring chemical compositions. A current trend in the research of optical refractive-index sensors focuses on making the sensors compact and highly sensitive [1-3]. We have investigated the refractometric sensing properties of grated silicon photonic wires (GSPW), fabricat...

Photonic Crystal Laser Based Gas Sensor

Design and Simulation of a New Highly Sensitive Gas Sensor Based on Negative Refraction Photonic Crystal

In this paper, design and simulation of a new highly sensitive gas sensor based on a hybrid photonic crystal (PC) structure, containing negative and positive refractive index sections, is presented. It has been shown that using a PC with negative refraction in the first section, the transmitted power is concentrated on the entrance of the sensing channel, and the transmission of the proposed se...

Time-resolved oxygen production by PSII: chasing chemical intermediates.

Photosystem II (PSII) produces dioxygen from water in a four-stepped process, which is driven by four quanta of light and catalysed by a Mn-cluster and tyrosine Z. Oxygen is liberated during one step, coined S(3)=>S(0). Chemical intermediates on the way from reversibly bound water to dioxygen have not yet been tracked, however, a break in the Arrhenius plot of the oxygen-evolving step has been ...