EXCITATION ENHANCEMENT AND EXTRACTION ENHANCEMENT WITH PHOTONIC CRYSTALS

摘要

Disclosed herein is a system for stimulating an emission from at least one emitter, such as a quantum dot or organic molecule, on the surface of a photonic crystal comprising a patterned dielectric substrate. Embodiments of this system include a laser or other source that illuminates the emitter and the photonic crystal, which is characterized by an energy band structure exhibiting a Fano resonance, from a first angle so as to stimulate the emission from the emitter at a second angle. The coupling between the photonic crystal and the emitter may result in spectral and angular enhancement of the emission through excitation and extraction enhancement. These enhancement mechanisms also reduce the emitter's lasing threshold. For instance, these enhancement mechanisms enable lasing of a 100 nm thick layer of diluted organic molecules solution with reduced threshold intensity. This reduction in lasing threshold enables more efficient organic light emitting devices and more sensitive molecular sensing.

主权项

1. A system for stimulating an emission from at least one emitter, the system comprising:
a photonic crystal, characterized by an energy band structure exhibiting a Fano resonance, comprising a patterned dielectric substrate defining a surface to support the at least one emitter; and a radiation source, in optical communication with the photonic crystal and the at least one emitter, to irradiate the at least one emitter at a first angle with respect to the surface of the photonic crystal so as to stimulate the emission from the at least one emitter at a second angle with respect to the surface of the photonic crystal.