Tag Archives: Infrared

Innovation in Targeted Drug Delivery Using Gold Coatings

Cancer cells photographed by camera attached t...

Cancer cells photographed by camera attached to microscope in time-lapse manner. Image via Wikipedia

The upside of chemotherapy is that it attacks cancer cells and kills them. The downside – and a steep downside it is – is that it is composed of highly toxic compounds that attack other cells of the body, too, resulting in any number of harmful side effects, from anemia to hair loss to nausea and vomiting.

The question concerning researchers is how do we deliver chemotherapy drugs to the harmful cells and leave the healthy cells alone?

JILA develops efficient Source of Terahertz Radiation for Imaging

JILA researchers have developed a laser-based source of terahertz radiation that is unusually efficient and less prone to damage than similar systems. The technology might be useful in applications such as detecting trace gases or imaging weapons in security screening.

terahertz radiation instrument terahertz radiation instrument

JILA instrument for generating terahertz radiation. Ultrafast pulses of near-infrared laser light enter through the lens at left, striking a semiconductor wafer studded with electrodes (transparent square barely visible under the white box connected to orange wires) bathed in an oscillating electric field. The light dislodges electrons, which accelerate in the electric field and emit waves of terahertz radiation. At right is a close-up of the electron source.

JILA is a joint institute of the National Institute of Standards and Technology (NIST) and the University of Colorado at Boulder.


This article will interface you with the step by step things required when you are about to make your own Pulse oximeter.

Principles of Pulse Oximetry Technology:

The principle of pulse oximetry is based on the red and infrared light absorption characteristics of oxygenated and deoxygenated hemoglobin. Oxygenated hemoglobin absorbs more infrared light and allows more red light to pass through. Deoxygenated (or reduced) hemoglobin absorbs more red light and allows more infrared light to pass through. Red light is in the 600-750 nm wavelength light band. Infrared light is in the 850-1000 nm wavelength light band.