Highly effective thin film optical filter constructed of semiconductor quantum dot 3D arrays in an organic host

Abstract

We calculate the imaginary partofthethird order optical non-linearity for an array of semiconductor quantum dots in an organic host and show that it leads to large two-photon absorption. The calculated two-photon absorption is greater than currently measured materials. The large non-linearity results from a hybrid exciton formed in the inorganic-organic medium. The band gap of the semiconductor dot determines the spectral region of the resonances that vary from the visible to the near, mid and far infrared regions. We show that relatively small changes in the ratio ofthe quantum dot size to the quantum dot-to-dot spacing result in significant changes in the non-linearity. We briefly describe applications in communications, optical filters, and bio photonics for thin films comprising these hybrid excitons.

Exciton hybridization states in organic–semiconductor heterostructures containing quantum dots

“…the effective interaction between the dendrimer generations is obtained [7]. As a result, the effective interaction between site 0 and site n, i.e.…”

“…With the goal of designing a new generation of materials having applications in high-speed lasers, light sources and telecommunications, a large amount of experimental and theoretical research has been focusing on heterostructures combining organic and semiconductor materials [1][2][3][4][5][6][7][8][9][10][11]. Recent development of nanotechnology allows the possibility of the realization of low-dimensional systems containing both organic and inorganic materials, a new class of materials, giving us the opportunity to investigate the optical properties of organic-inorganic hybrid states for both fundamental background and opto-electronic device application purposes.…”

“…Recent development of nanotechnology allows the possibility of the realization of low-dimensional systems containing both organic and inorganic materials, a new class of materials, giving us the opportunity to investigate the optical properties of organic-inorganic hybrid states for both fundamental background and opto-electronic device application purposes. This paper reviews the theoretical study of Wannier-Frenkel hybrid excitons in organic-semiconductor heterostructures containing quantum dots [5][6][7][8][9][10].…”

“…This competition leads to unique electronic structures and optical properties of the exciton in quantum dots, which could be used to build new materials. The system of a semiconductor quantum dot array embedded in a medium of organic material [5][6][7] and a dendrimeric structure with a dot at the center [8] have been considered by Huong and Birman. Such structures were reported to have been fabricated in several labs [23,28].…”

“…Such structures were reported to have been fabricated in several labs [23,28]. For these models, the authors predict a large enhancement of nonlinearities at resonance, in some cases about two orders of magnitude in comparison with the traditional systems [5][6][7]. The effects of applying external electric and magnetic fields to the system that produces the quantum dot hybrid exciton have been studied for an organic-coated semiconductor spherical quantum dot [9].…”