Professor Shanghai Jiaotong University invented the "light scale" to weigh the weight of a single proton
The scale is a familiar item. However, have you ever heard of "light scales"? Professor Zhuka of Shanghai Jiaotong University invented such a scale for "weighing" microscopic particles such as atoms and protons. It replaces the traditional electrical measurement with an all-optical method, and is considered by the American Physical Society as "promising to lead nanoscience into a new measurement field."
Zhuka ’s professor told reporters that with the rapid development of quantum information and quantum measurement technology, the exploration of the singular world of quantum has become the unremitting pursuit of research scholars from various countries. He and his supervised Dr. Li Jinjin based on quantum optics and nanomaterials as the basis for their research, for the first time in the world, they proposed a nano-optical mass spectrometer, also known as an "optical scale", which can measure the quality of biological DNA molecules, chromosomes and neutral atoms. The quality of non-destructive high-precision optical measurement.
Existing measurement methods cannot be accurate to the measurement of a single atom, but can only use a bunch of atoms as a unit of measurement for repeated measurements, and then estimate the mass of the atoms. So how to use the "light scale" to measure the mass of an atom? Professor Zhuka introduced that the atom to be measured is placed on the surface of a carbon nanotube, and then two beams of light with different intensities are illuminated on the carbon nanotube at the same time. At this time, by detecting the absorption spectrum of the weak light, the vibration frequency of the carbon nanotube can be accurately obtained. We have to measure the vibration frequency of the carbon nanotubes two times in succession to obtain the amount of change in the vibration frequency of the carbon nanotubes before and after the atoms are inserted, and the mass of a single atom falling on the surface of the carbon nanotubes can be obtained by calculation. "In fact, there are no new aspects or principles in physics, but no one has considered such a scheme before."
According to Professor Zhuka ’s estimation, the “optical scale†controlled by full light has a sensitivity and accuracy nearly three orders of magnitude higher than that of a traditional electrical mass spectrometer.
The research on the measurement of a single neutral atom has come to an end. At present, Zhuka's team of professors is studying the measurement of a single proton or neutron through "light beam". They also hope to apply the "light scale" to the study of biological DNA molecules. According to reports, the quality of traditional cancerous DNA molecules should not be exactly the same as that of normal DNA molecules. Using high-precision "light" weighing, it may be possible to detect the presence of cancer cells earlier and more accurately.
Ningbo Vinny International Trading Co., Ltd , http://www.vinnystationery.com