| mang2004 |
2019-09-09 05:15 |
原理： *P:`{ZV7=W
His team’s spectrometer doesn’t use any optical components, instead it relies on a semiconducting nanowire grown from a vapor of cadmium sulfide and cadmium selenide. At one end, the nanowire is mostly cadmium selenide, which absorbs redder light. The composition gradually changes along the length of the wire, so that the opposite end is mostly cadmium sulfide, which absorbs bluer light. &X_ I^*
In the new spectrometer, the researchers mount one of these nanowires on a silicon substrate and then overlay it with a comb of indium-gold electrodes, forming up to 38 distinct regions along the nanowire. Each region responds to a different wavelength of visible light, producing a current between the pair of electrodes around it. Software then analyzes these signals and turns them into a spectrum. ] V]~I.
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