Integrated photonic devices were realized using colloidal quantum dot composites such as flexible microcavity laser, microdisk emitters and integrated active-passive waveguides. The microcavity laser structure was realized using spin coating and consisted of an all-polymer distributed Bragg reflector with a poly-vinyl carbazole cavity layer embedded with InGaP/ZnS colloidal quantum dots. These microcavities can be peeled off the substrate yielding a flexible structure that can conform to any shape and whose emission spectra can be mechanically tuned. Planar photonic devices consisting of vertically coupled microring resonators, microdisk emitters, active-passive integrated waveguide structures and coupled active microdisk resonators were realized using soft lithography, photo-lithography, and electron beam lithography, respectively. The gain medium in all these devices was a composite consisting of quantum dots embedded in SU8 matrix. Finally, the effect of the host matrix on the optical properties of the quantum dots using results of steady-state and time-resolved luminescence measurements was determined. In addition to their specific functionalities, these novel device demonstrations and their development present a low-cost alternative to the traditional photonic device fabrication techniques.
We discuss our work on light emitters and photonic circuits realized using colloidal quantum dot composites.
Specifically we will report our recent work on flexible microcavity laser, microdisk emitters and integrated active -
passive waveguides. The entire microcavity laser structure was realized using spin coating and consisted of an all-polymer
distributed Bragg reflector with a poly-vinyl carbazole cavity layer embedded with InGaP/ZnS colloidal
quantum dots. These microcavities can be peeled off the substrate yielding a flexible structure that can conform to any
shape and whose emission spectra can be mechanically tuned. The microdisk emitters and the integrated waveguide
structures were realized using soft lithography and photo-lithography, respectively and were fabricated using a
composite consisting of quantum dots embedded in SU8 matrix. Finally, we will discuss the effect of the host matrix on
the optical properties of the quantum dots using results of steady-state and time-resolved luminescence measurements. In
addition to their specific functionalities, these novel device demonstrations and their development present a low cost
alternative to the traditional photonic device fabrication techniques.
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