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Ultrafast transient sub-bandgap absorption of monolayer MoS2

Light(Science & Applications) 2021年第2期10卷 234-242页

作者： Susobhan Das Yadong Wang Yunyun Dai Shisheng Li Zhipei Sun Department of Electronics and Nanoengineering Aalto University02150 EspooFinland International Center for Young Scientists(ICYS) National Institute for Materials Science(NIMS)TsukubaJapan QTF Centre of Excellence Department of Applied PhysicsAalto UniversityEspooFinland

The light-matter interaction in materials is of remarkable interest for various photonic and optoelectronic applications,which is intrinsically determined by the bandgap of the materials *** extend the applications beyond the bandgap limit,it is of great significance to study the light-matter interaction below the material ***,we report the ultrafast transient absorption of monolayer molybdenum disulfide in its sub-bandgap region from-0.86 pm to 1.4 *** though this spectral range is below the bandgap,we observe a significant absorbance enhancement up to-4.2%in the monolayer molybdenum disulfide(comparable to its absorption within the bandgap region)due to pump-induced absorption by the excited carrier *** different rise times of the transient absorption at different wavelengths indicate the various contributions of the different carrier states(i.e.,real carrier states in the short-wavelength region of~he long wavelength region of~>1μm).Our results elucidate the fundamental understanding regarding the optical properties,excited carrier states,and carrier dynamics in the technologically important near-infrared region,which potentially leads to various photonic and optoelectronic applications(e.g„excited-state-based photodetectors and modulators)of two-dimensional materials and their heterostructures beyond their intrinsic bandgap limitations.

关键词： absorption transient monolayer

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Coherent modulation of chiral nonlinear optics with crystal symmetry

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Light(Science & Applications) 2022年第8期11卷 1909-1915页

作者： Yi Zhang Xueyin Bai Juan Arias Muñoz Yunyun Dai Susobhan Das Yadong Wang Zhipei Sun Department of Electronics and Nanoengineering Aalto University02150EspooFinland QTF Centre of Excellence Department of Applied PhysicsAalto University02150EspooFinland Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of Technology100081BeijingChina

Light modulation is of paramount importance for photonics and optoelectronics. here we report all-optical coherent modulation of third-harmonic generation (ThG) with chiral light via the symmetry enabled polarization selectivity. The concept is experimentally validated in monolayer materials (MoS2) with modulation depth approaching ~100%, ultra-fast modulation speed (h-independence features. Moreover, the power and polarization of the incident optical beams can be used to tune the output chirality and modulation performance. Major performance of our demonstration reaches the fundamental limits of optical modulation: near-unity modulation depth, instantaneous speed (ultra-fast coherent interaction), compact footprint (atomic thickness), and unlimited operation bandwidth, which hold an ideal optical modulation solution for emerging and future nonlinear optical applications (e.g., interconnection, imaging, computing, and quantum technologies).

关键词： polarization interconnection symmetry

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hybrid integration of 2D materials for on-chip nonlinear photonics

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Light(Advanced Manufacturing) 2023年第3期4卷 311-333页

作者： Vincent Pelgrin hoon hahn Yoon Eric Cassan Zhipei Sun QTF Centre of Excellence Department of Electronics and NanoengineeringAalto UniversityP.O.Box 13500FI-00076 AaltoFinland UniversitéParis-Saclay CNRSCentre de Nanosciences et de Nanotechnologies91120PalaiseauFrance

Interests surrounding the development of on-chip nonlinear optical devices have been consistently growing in the past decades due to the tremendous applications,such as quantum photonics,all-optical communications,optical computing,on-chip metrology,and *** efficient on-chip nonlinear optical devices to meet the requirements of those applications brings the need for new directions to improve the existing photonic *** research has directed the field of on-chip nonlinear optics toward the hybrid integration of two-dimensional layered materials(such as graphene,transition metal dichalcogenides,and black phosphorous)with various integrated *** combination of well-known photonic chip design platforms(e.g.,silicon,silicon nitride)and different two-dimensional layered materials has opened the road for more versatile and efficient structures and devices,which has the great potential to unlock numerous new *** review discusses the modeling and characterization of different hybrid photonic integration structures with two-dimensional materials,highlights the current state of the art examples,and presents an outlook for future prospects.

关键词： Integrated photonics 2D materials Nanophotonic Nonlinear optics Quantum computation All-optical computing Spectroscopy Broadband light sources

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