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241. Nanoscale Manipulation of Exciton–Trion Interconversion in a MoSe2Monolayer via Tip-Enhanced Cavity-Spectroscopy

Author

Kang, Mingu, Kim, Su Jin, Joo, Huitae, Koo, Yeonjeong, Lee, Hyeongwoo, Lee, Hyun Seok, Suh, Yung Doug, and Park, Kyoung-Duck

Abstract

Emerging light–matter interactions in metal–semiconductor hybrid platforms have attracted considerable attention due to their potential applications in optoelectronic devices. Here, we demonstrate plasmon-induced near-field manipulation of trionic responses in a MoSe2monolayer using tip-enhanced cavity-spectroscopy (TECS). The surface plasmon–polariton mode on the Au nanowire can locally manipulate the exciton (X0) and trion (X-) populations of MoSe2. Furthermore, we reveal that surface charges significantly influence the emission and interconversion processes of X0and X-. In the TECS configuration, the localized plasmon significantly affects the distributions of X0and X- due to the modified radiative decay rate. Additionally, within the TECS cavity, the electric doping effect and hot electron generation enable dynamic interconversion between X0and X- at the nanoscale. This work advances our understanding of plasmon–exciton–hot electron interactions in metal–semiconductor–metal hybrid structures, providing a foundation for an optimal trion-based nano-optoelectronic platform.

Published
2024
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249. Differences in Factors Predicting Lymph Node Metastasis Between pT1 Rectal Cancer and pT1 Colon Cancer: A Retrospective Study

Author

Cho, Sung Hwan, Park, Byung-Soo, Son, Gyung Mo, Kim, Hyun Sung, Kim, Su Jin, Park, Su Bum, Choi, Cheol Woong, Kim, Hyung Wook, Shin, Dong Hoon, and Yun, Mi Sook

Abstract

Background Studies have demonstrated conflicting results regarding factors that predict lymph node metastasis (LNM) in pT1 colorectal cancers. We hypothesized that these discrepancies could be related to different factors predicting LNM between rectal and colon cancer. This study aimed to compare predicting factors for LNM between pT1 rectal and colon cancer.Methods This retrospective study evaluated a prospectively maintained database that included 380 patients with pT1 colorectal cancer from January 2010 to December 2020. Patients were grouped according to whether they had rectal or colon cancer, with or without LNM, and factors predicting LNM were analyzed.Results In pT1 rectal cancer, LNM was associated with deeper submucosal (SM) invasion (P = .024) and a higher proportion of poorly differentiated tumors (P = .006). In pT1 colon cancer, LNM was associated with a higher proportion of moderately/poorly differentiated tumors (P = .002) and lymphatic invasion (P = .004). In the multivariate analysis for rectal cancer, depth of SM invasion (≥3000 μm) was an independent predictive factor for LNM (95% confidence interval [CI], 1.48-27.94; P = .013), whereas for colon cancer, moderately/poorly differentiated tumors (95% CI, 1.38-8.13; P = .008) and lymphatic invasion (95% CI, 1.44-11.78; P = .008) were independent predictive factors for LNM.Discussion There were distinct differences in the factors predicting LNM between pT1 rectal cancer and colon cancer. These results suggest the necessity in differentiating between rectal and colon cancer when performing studies on LNM in pT1 colorectal cancer.

Published
2023
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