Spectroscopy provides not only valuable information for materials, but also the next step to go further. Our group has developed hyperspectral imaging systems for the two main applications: i) hyperspectral microscopic characterization of materials and photonic devices, ii) ultrasensitive hyperspectral biosensing platforms. We have successfully applied the spectroscopic-imaging/sensing approach to various studies including the revelation of microscopic origins for the low efficiency in green LEDs, the observation of mesostructures related to opto-electrical-mechanical coupling in 2D materials, as well as ultrasensitive hyperspectral biosensing of toxic molecules using plasmonic nanoparticles. As the next step, we are studying the single-photon-emitting characteristics of perovskite quantum dots to build a completely new implementation of single photon emitters.

Publication Highlights

• Young-Chul Leem, Zhenyao Fang, Yun-Kyung Lee, Na-Yeong Kim, Arvin Kakekhani, Wenjing Liu, Sung-Pyo Cho, Cheolsu Kim, Yuhui Wang, Zhurun Ji, Abhirup Patra, Leeor Kronik, Andrew M. Rappe, Sang-Youp Yim, Ritesh Agarwal, "Optically Triggered Emergent Mesostructures in Monolayer WS2," Nano Letters 24, 5436 (2024).

• Soogeun Kim, Sang-Hyun Hong, Joon Heon Kim, Myoung-Kyu Oh, Tae Joong Eom, Yang Ho Park, Gil Ho Shin, Sang-Youp Yim, "Early on–site detection of strawberry anthracnose using portable Raman spectroscopy," Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 303, 123150 (2023).

• Na-Yeong Kim, Young-Chul Leem, Sang-Hyun Hong, Jin-Ho Park, Sang-Youp Yim, "Ultrasensitive and stable plasmonic surface-enhanced Raman scattering substrates covered with atomically thin monolayers: effect of the insulating property," ACS Applied Materials & Interfaces 11, 6363 (2019).

• Young-Chul Leem, Sang-Youp Yim, "Microscopic observation of low efficiency in green light-emitting diodes," ACS Photonics 5, 1129 (2018).