Abstract
Non-bandgap defect modes, defect modes showing up in photonic crystal (PhC) structureswhich do not exhibit a complete photonic bandgap, are investigated experimentally bymeans of a QWIP (quantum well intersubband photodetector) incorporated within atwo-dimensional (2D) triangular photonic crystal of air holes. The modes appear as a localenhancement in the photocurrent spectrum due to an increased in-coupling of surfaceincident light when a defect mode is present. Such delocalized non-bandgap defect modesand the influence of the entire PhC on their energetic positions are experimentallydetermined and show good agreement with (2D as well as three-dimensional (3D))simulations.
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