Selectable-frequency and tunable-Q perfect transmissions of electromagnetic waves in dielectric heterostructures.

Multiple perfect transmissions of electromagnetic waves are found in the photonic band gap of the symmetric dielectric heterostructures (SDH) constructed as (AB)ⁿB^m(BA)ⁿ, where A and B stand for different dielectric materials, and m and n are the repeating numbers of the units. The photonic frequency and the mode number of resonant transmissions therein can be manipulated by varying m, and the quality factor Q of the perfect transmission peak increases exponentially with increasing n. These features are experimentally demonstrated in a SDH of TiO₂/SiO₂ for visible and near infrared light. The possible applications of SDH for the wavelength division multiplexing system are discussed. [ABSTRACT FROM AUTHOR]