Probing near-field heating effects on monolayer MoS2 photoluminescence via tip-enhanced Raman spectroscopy

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-03-24 DOI:10.1063/5.0250931

Kishore K. Madapu, C. Abinash Bhuyan, Sandip Dhara

引用次数: 0

Abstract

The photoluminescence (PL) intensity of monolayer MoS2 is limited by weak optical absorption due to its atomic scale thickness. To enhance PL intensity, field enhancement techniques, such as surface plasmon resonance (SPR) of metal nanoparticles, are often employed. However, SPR-induced light confinement at the nanoscale also leads to significant localized heating. In this study, we investigated the impact of near-field heating due to SPR using tip-enhanced Raman spectroscopy (TERS) and tip-enhanced photoluminescence studies. Our results reveal nearly an order-of-magnitude difference in the enhancement factors (EFs) for Raman and PL signals of monolayer MoS2, with a local temperature increase of approximately 147 °C under the TERS tip at a laser power of 10.57 mW. The reduced PL EF compared with Raman EF is attributed to additional near-field heating from SPR. We further observed that local temperature fluctuations critically affect the EFs and found that a high thermal conductivity substrate can effectively mitigate the near-field thermal effects associated with SPR.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.