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您的检索式：作者名="Hongki Yoo"
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| 1 | Ultra-thin light-weight laser-induced-graphene (LIG) diffractive optics显示文摘The realization of hybrid optics could be one of the best ways to fulfll the technological requirements of compact,light-weight,and multi-functional optical systems for modern industries.Planar diffractive lens(PDL)such as diffractive lenses,photonsieves,and metasurfaces can be patterned on ultra-thin flexible and stretchable substrates and be conformally attached on top of arbitrarily shaped surfaces.In this review,we introduce recent research works addressed to the design and manufacturing of ultra-thin graphene optics,which will open new markets in compact and light-weight optics for next-generation endoscopic brain imaging,space internet,real-time surface proflometry,and multi-functional mobile phones.To provide higher design flexibility,lower process complexity,and chemical-free process with reasonable investment cost,direct laser writing(DLW)of laser-induced-graphene(LIG)is actively being applied to the patterning of PDL.For realizing the best optical performances in DLW,photon-material interactions have been studied in detail with respect to different laser parameters;the resulting optical characteristics have been evaluated in terms of amplitude and phase.A series of exemplary laser-written 1D and 2D PDL structures have been actively demonstrated with different base materials,and then,the cases are being expanded to plasmonic and holographic structures.The combination of these ultra-thin and light-weight PDL with conventional bulk refractive or reflective optical elements could bring together the advantages of each optical element.By integrating these suggestions,we suggest a way to realize the hybrid PDL to be used in the future micro-electronics surface inspection,biomedical,outer space,and extended reality(XR)industries. | Younggeun Lee Mun Ji Low Dongwook Yang Han Ku Nam Truong-Son Dinh Le Seung Eon Lee Hyogeun Han Seunghwan Kim Quang Huy Vu Hongki Yoo Hyosang Yoon Joohyung Lee Suchand Sandeep Keunwoo Lee Seung-Woo Kim Young-Jin Kim | 2023 | Light(Science & Applications)2023，12，7： | 1 |
| 2 | Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging显示文摘High-speed and high-resolution imaging of surface profiles is critical for the investigation of various structures and mechanical dynamics of micro-and nano-scale devices.In particular,recent emergence of various nonlinear,transient and complex mechanical dynamics,such as anharmonic vibrations in mechanical resonators,has necessitated real-time surface deformation imaging with higher axial and lateral resolutions,speed,and dynamic range.However,real-time capturing of fast and complex mechanical dynamics has been challenging,and direct time-domain imaging of displacements and mechanical motions has been a missing element in studying full-field structural and dynamic behaviours.Here,by exploiting the electro-optic sampling with a frequency comb,we demonstrate a line-scan time-of-flight(TOF)camera that can simultaneously measure the TOF changes of more than 1000 spatial coordinates with hundreds megapixels/s pixel-rate and sub-nanometre axial resolution over several millimetres field-of-view.This unique combination of performances enables fast and precise imaging of both complex structures and dynamics in three-dimensional devices and mechanical resonators. | Yongjin Na Hyunsoo Kwak Changmin Ahn Seung Eon Lee Woojin Lee Chu-Shik Kang Jungchul Lee Junho Suh Hongki Yoo Jungwon Kim | 2023 | Light(Science & Applications)2023，12，2： | 1 |
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