Modulation behaviors of surface plasmon coupled light-emitting diode
Journal
Optics Express
Journal Volume
23
Journal Issue
6
Pages
8150-8161
Date Issued
2015-03
Author(s)
Chun-Han Lin
Chia-Ying Su
Erwin Zhu
Yu-Feng Yao
Chieh Hsieh
Charng-Gan Tu
Hao-Tsung Chen
Abstract
The modulation bandwidths of the light-emitting diodes (LEDs) of different mesa sizes with and without surface plasmon (SP) coupling effect are compared. Due to the significant increase of carrier decay rate, within the size range of LED square-mesa from 60 through 300 micron and the injected current-density range from 139 through 1667 A/cm², the SP coupling can lead to the enhancement of modulation bandwidth by 44-48%, independent of the variations of LED mesa size or injected current level. The enhancement ratios of modulation bandwidth of the samples with SP coupling with respect to those of the samples without SP coupling are lower than the corresponding ratios of the square-root of photoluminescence decay rate due to the increases of their RC time constants (the product of device resistance and capacitance). The increases of the RC time constants in the samples with SP coupling are attributed to the increases of their device resistance levels when the Ag nanoparticles and GaZnO dielectric interlayer are added to the LED surface for effectively inducing SP coupling.
SDGs
Type
journal article