Time-Resolved Optical Spectroscopy

Balocchi, Andréa; Amand, T.; Marie, X.

doi:10.1007/978-3-642-23351-7_8

Cited by 2 publications

(3 citation statements)

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“…These experiments are used for studying exciton dynamics such as the exciton lifetime. In addition to time-resolved PL (an incoherent technique, in which the phases of the incoming and outgoing light do not match, owing to real absorption in the material), important information can also be gleaned from coherent spectroscopy such as four-wave mixing and two-colour pump-probe experiments 41,[121][122][123] .…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

“…Time-resolved PL can be performed by using a pulsed laser excitation and measuring the recombination (emission) time; for a detailed introduction to time-resolved spectroscopy, see reF. 121 . In clean TMD samples, the strong exciton oscillator strength leads to an intrinsic radiative lifetime of the order of 1 ps at low temperature 141 for free excitons.…”

Section: Emission Dynamicsmentioning

confidence: 99%

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Guide to optical spectroscopy of layered semiconductors

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Section: Photoluminescence Spectroscopymentioning

confidence: 99%

Section: Emission Dynamicsmentioning

confidence: 99%

Guide to optical spectroscopy of layered semiconductors

et al. 2020

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“…The succession of all involved relaxation and recombination events lasts a relatively long time, which is a main difference compared to other types of so-called secondary radiation: reflected light and scattered light (for example Raman). Once the material is excited with a light pulse, the luminescence continues to decay for some time and can be recorded in time-resolved photoluminescence [116], see a review on time-resolved spectroscopy [118] for technical details. These experiments give information on carrier relaxation and recombination times.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

Guide to optical spectroscopy of layered semiconductors

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Paradisanos,

Marie

et al. 2020

Preprint

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In this technical review we give an introduction to optical spectroscopy for layered materials as a powerful, non-invasive tool to access details of the electronic band structure and crystal quality. Potential applications in photonics and optoelectronics are based on our understanding of the light-matter interaction on an atomic monolayer scale. Here atomically thin transition metal dichalcogenides, such as MoS2 and WSe2, are model systems for layered semiconductors with a bandgap in the visible region of the optical spectrum. They can be assembled to form heterostructures and combine the unique properties of the constituent monolayers. We review the working principles of micro-photoluminescence spectroscopy and optical absorption experiments. We discuss the physical origin of the main absorption and emission features in the optical spectra and how they can be tuned. We explain key-aspects of practical set-ups for performing experiments in different conditions such as variable temperatures or in applied magnetic fields and how parameters such as detection spot size and excitation laser wavelength impact the optical spectra. We describe the important influence of the direct sample environment, such as substrates and encapsulation layers, on the emission and absorption mechanisms. A survey of optical techniques that probe the coupling between layers and analyse carrier polarisation dynamics for spin-and valleytronics is provided.

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Time-Resolved Optical Spectroscopy

Cited by 2 publications

References 44 publications

Guide to optical spectroscopy of layered semiconductors

Guide to optical spectroscopy of layered semiconductors

Guide to optical spectroscopy of layered semiconductors

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