Donor and acceptor modes in photonic band structurePhysical Review Letters, Vol. 67, No. 24. (December 1991), 3380.
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AbstractThree-dimensionally periodic dielectric structures; photonic crystals; possessing a forbidden gap for electromagnetic wave propagation; a photonic band gap; are now known. If the perfect 3D periodicity is broken by a local defect; local electromagnetic modes can occur within the forbidden band gap. Addition of extra dielectric material locally; inside the photonic crystal; produces ââdonorââ modes. Conversely; local removal of dielectric material from the crystal produces ââacceptorââ modes. It is now possible to make high- Q electromagnetic cavities of â¼1 cubic wavelength; for short wavelengths at which metallic cavities are useless. These new dielectric cavities can cover the range from mm waves to UV wavelengths.
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