Terahertz on a Chip

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Science  02 Aug 2002:
Vol. 297, Issue 5582, pp. 763
DOI: 10.1126/science.297.5582.763

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In the Star Tiger team's photonic bandgap material, silicon "logs" are lined up to create a macroscopic version of a crystal lattice: a structure with arrays of holes like the serried ranks of atoms in a crystal. And just as a semiconductor's crystalline structure can forbid the movement of electrons with particular energies--an energy bandgap--a silicon "woodpile" blocks certain wavelengths of radiation.