Enhance the blue-light emission of black-body radiation with metallic photonic boxes

Black-body radiation can be modified for blue-light enhancement. Using photonic boxes of about 200 nm, the enhanced blue light has peak intensity at 390 nm and a spectral width of 90 nm, which are both temperature-independent. The spectrum is also suppressed at long-wavelength region, so the enhanced peak intensity is over 5 times stronger than the background level at 470 nm for all measured temperatures. In contrast, for usual black-body radiation at those temperatures, the intensity is over 1000 times weaker at 390 nm than above 470 nm. Other visible spectra can also be enhanced by increasing the size of photonic boxes.