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Nanophotonics technology enables a new kind of optical spectrometer

Traditional optical spectrometers measure the spectra of light. Traditional optical sensors use light to detect the presence of chemicals. A spectrometer sensor is an optical spectrometer and also a chemical sensor because it measures the optical resonance spectrum that is controlled by chemicals bonded on the nanostructure surface. A spectrometer sensor with a super nanoslit metal grating was first published in Optics Letters (vol. 36, 2011) and a spectrometer sensor with a super nanohole metal grating was published recently in Optics Express (vol. 20, 2012). Nano-gratings are periodic nanostructures with the feature size in the nanometer scale. One nanometer is one millionth of a millimeter, about 1/50,000th of the diameter of a human hair. Because the feature size of nanostructures is less than the wavelength of light, we are not able to see nanostructures with our eyes. However, light can sense nanostructures by strong absorptions at specific wavelengths. This phenomenon is called optical resonance of nanostructures, a fundamental phenomenon in optics…>>>more

Categorías:Nano-technology
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