Tip-Enhanced Photoluminescence of Freestanding Lateral Heterobubbles

被引:17
作者
Albagami, Abdullah [1 ,2 ]
Ambardar, Sharad [3 ]
Hrim, Hana [1 ]
Sahoo, Prasana K. [4 ]
Emirov, Yusuf [5 ]
Gutierrez, Humberto R. [1 ]
Voronine, Dmitri V. [1 ,3 ]
机构
[1] Univ S Florida, Dept Phys, Tampa, FL 33620 USA
[2] King Saud Univ, Dept Phys, Riyadh 11362, Saudi Arabia
[3] Univ S Florida, Dept Med Engn, Tampa, FL 33620 USA
[4] India Inst Technol Kharagpur, Mat Sci Ctr, Kharagpur 721302, W Bengal, India
[5] Univ S Florida, Nanotechnol Res & Educ Ctr, Tampa, FL 33620 USA
关键词
nanobubble; lateral heterostructure; TEPL; exciton funneling; enhancement mechanism; HETEROSTRUCTURES; SPECTROSCOPY; TRANSITION; PLASMONS; BUBBLES; GROWTH; WSE2;
D O I
10.1021/acsami.1c24486
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Two-dimensional (2D) semiconducting materials have promising applications in flexible optoelectronics, nanophotonics, and sensing based on the broad tunability of their optical and electronic properties. 2D nanobubbles form exciton funnels due to localized strain that can be used as local emitters for information processing. Their nanoscale optical characterization requires the use of near-field scanning probe microscopy (SPM). However, previous near-field studies of 2D materials were performed on SiO2/Si and metallic substrates using the plasmonic gap mode to increase the signal-to-noise ratio. Another challenge is the deterministic control of bubble size and location. We addressed these challenges by investigating the photoluminescence (PL) signals of freestanding monolayer lateral WSe2-MoSe2 heterostructures under the influence of strain exerted by a plasmonic SPM tip. For first time, we performed tip-enhanced PL imaging of freestanding 2D materials and studied the competition between the PL enhancement mechanisms by nanoindentation as a function of the tip-sample distance. We observed the tunability of PL as a function of bubble size, which opens new possibilities to design optoelectronic nanodevices.
引用
收藏
页码:11006 / 11015
页数:10
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