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您的检索式：作者名="Sangha Lee"
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| 1 | Non-Hermitian chiral degeneracy of gated graphene metasurfaces显示文摘Non-Hermitian degeneracies,also known as exceptional points(EPs),have been the focus of much attention due to their singular eigenvalue surface structure.Nevertheless,as pertaining to a non-Hermitian metasurface platform,the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive manner.Here,we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated graphene metasurface.More specifically,the measured non-Hermitian Jones matrix in parameter space enables the quantification of nonorthogonality of polarisation eigenstates and half-integer topological charges associated with a chiral EP.Interestingly,the output polarisation state can be made orthogonal to the coalesced polarisation eigenstate of the metasurface,revealing the missing dimension at the chiral EP.In addition,the maximal nonorthogonality at the chiral EP leads to a blocking of one of the cross-polarised transmission pathways and,consequently,the observation of enhanced asymmetric polarisation conversion.We anticipate that electrically controllable non-Hermitian metasurface platforms can serve as an interesting framework for the investigation of rich non-Hermitian polarisation dynamics around chiral EPs. | Soojeong Baek Sang Hyun Park Donghak Oh Kanghee Lee Sangha Lee Hosub Lim Taewoo Ha Hyun Sung Park Shuang Zhang Lan Yang Bumki Min Teun-Teun Kim | 2023 | Light(Science & Applications)2023，12，5： | 1 |
| 2 | Beamspace-domain multichannel nonnegative matrix factorization for audio source separation显示文摘 | LEE Seokjin PARK Sangha SUNG Koengmo | 2012 | IEEE Signal Processing Letters2012，19，1： | 1 |
| 3 | Cross-linked chitosan as an efficient binder for Si anode of Li-ion batteries显示文摘 | Chert Chao Lee Sangha Cho Misuk | 2016 | ACS Appl Mater Interfaces2016，8，4： | 1 |
| 4 | Correlation analysis of hyperspectral imagery for multispectral wavelength selection for detection of defects on apples显示文摘 | Kangjin Lee Sukwon Kang Stephen R. Delwiche Moon Sung Kim Sangha Noh | 2008 | Sensing and Instrumentation for Food Quality and Safety2008，，2： | 1 |
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