Photonics Research, Volume. 6, Issue 1, 30(2018)
Enhanced light emission from AlGaN/GaN multiple quantum wells using the localized surface plasmon effect by aluminum nanoring patterns
Fig. 1. (a) Schematics of the processing steps used to fabricate Al nanoring arrays using
Fig. 2. (a) Schematic of the AlGaN/GaN-based near-UV LED structure with Al nanorings to capture both AFM and TEM images. (b) AFM image of the top surface of the near-UV LED with 385 nm Al nanorings that have an HCP array structure and height distribution. (c) STEM cross-sectional image of the AlGaN/GaN-based near-UV LED with Al nanorings and (d) the corresponding EDS mapping image of Al element (green color).
Fig. 3. 3D FDTD simulations of the Al nanoring array, which has an HCP structure with outer diameters of 385 nm, plasmonic system. (a) Schematic of the simulated Al nanoring array–HCP unit cell structure. (b) Simulated absorbance spectra of the Al nanoring array with an HCP unit cell on the glass substrate, when the incident light was both TE and TM polarized. Top views of the local electric field distributions of Al nanorings with HCP unit cell on the
Fig. 4. (a) Power-dependent PL measurements with source power of 0.03, 0.1, 0.5, 2, and 8 mW from bottom to top. (b) Time-resolved PL spectra of the AlGaN/GaN MQW structure with and without Al nanorings at room temperature.
Fig. 5. (a) Temporal evolution of MQW emissions obtained at different temperatures for AlGaN/GaN MQW samples with and without Al nanoring structures. For both samples, temporal curves are normalized and vertically shifted for comparison. Measured PL lifetime
Fig. 6. TDPL measurements. PL spectra of AlGaN/GaN MQW structures (a) without Al nanorings (b) with Al nanorings at temperatures from 12 to 300 K. (c) Arrhenius plot of the normalized integrated PL intensities for AlGaN/GaN MQWs with and without Al nanorings.
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Kyung Rock Son, Byeong Ryong Lee, Min Ho Jang, Hyun Chul Park, Yong Hoon Cho, Tae Geun Kim, "Enhanced light emission from AlGaN/GaN multiple quantum wells using the localized surface plasmon effect by aluminum nanoring patterns," Photonics Res. 6, 30 (2018)
Category: Surface Plasmons
Received: Sep. 12, 2017
Accepted: Nov. 11, 2017
Published Online: Jul. 19, 2018
The Author Email: Tae Geun Kim (tgkim1@korea.ac.kr)