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Photocurrent enhancement in quantum dot (QD) infrared photodetector (QDIP) with an optical grating of subwavelength hole array in a thin metal film has been studied by calculating the transmission and diffraction of the infrared optical field through the grating and the light-matter interaction between the transmitted optical field and electrons confined in the QD. It is shown that due to the small aspect ratio of realistic QDs in QDIPs, the light diffraction due to the surface plasmon effect at the metal-semiconductor surface and the photonic subwavelength hole array structure is dominant in increasing the photocurrent.

We review the concepts of excitons and excitonic polaritons, their nonlinear optical properties in nanostructures and their applications within integrated electronics and optoelectronics. Various theoretical aspects of excitons and excitonic polaritons are introduced, followed by a summary of their experimental and application-specific development in nanostructures at the electronic and photonic engineering levels. A number of technical applications are highlighted.

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