We study polarization-dependent spontaneous emission (SE) rate and light extraction efficiency (LEE) in localized-surface-plasmon (LSP)-coupled light emitting diodes (LEDs). The closely packed seven Ag/SiO2 core-shell (CS) nanoparticles (NPs) lie on top of the GaN surface for LSP coupling with a radiated dipole. According to the dipole direction, both the SE rate and the LEE are significantly modified by the LSP effect at the Ag/SiO2 CS NPs when the size of Ag, the thickness of SiO2, and the position of the dipole source are varied. The enhancement of the SE rate is related to an induced dipole effect at the Ag, and the high LEE is caused by light scattering with an LSP mode at Ag/SiO2 CS NPs. We suggest the optimum position of the quantum well (QW) in blue InGaN/GaN LEDs with Ag/SiO2 CS NPs for practical application.
We have demonstrated lasing action from partially extended modes in deterministic aperiodic nanobeam cavities inflated by Rudin-Shapiro sequence with two different air holes at room temperature. By varying the size ratio of the holes and hence the structural aperiodicity, different optical lasing modes were obtained with maximized quality factors. The lasing characteristics of the partially extended modes were confirmed by numerical simulations based on scanning microscope images of the fabricated samples. We believe that this partially extended nanobeam modes will be useful for label-free optical biosensors.
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