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Directed Two-Photon Absorption in CdSe Nanoplatelets Revealed by k-Space Spectroscopy
Jan Heckmann1, Riccardo Scott1, Anatol V Prudnikau2
1Institute of Optics and Atomic Physics, Technical University of Berlin , Strasse des 17. Juni 135, 10623 Berlin, Germany.
Nano Letters
|September 13, 2017
Summary
Cadmium selenide (CdSe) nanoplatelets exhibit highly anisotropic two-photon absorption (TPA), making them effective directional absorbers. This directionality stems from material properties and confinement, enabling applications in photonic devices.
Area of Science:
- Materials Science
- Quantum Optics
- Nanotechnology
Background:
- Two-photon absorption (TPA) is a nonlinear optical process.
- CdSe nanoplatelets are semiconductor nanomaterials with unique optical properties.
Purpose of the Study:
- To investigate the anisotropy of TPA in CdSe nanoplatelets.
- To explore their potential as directional two-photon absorbers.
Main Methods:
- Utilized two-dimensional k-space spectroscopy.
- Compared one-photon and two-photon excitation of oriented CdSe nanoplatelet monolayers.
Main Results:
- Demonstrated highly anisotropic TPA in CdSe nanoplatelets.
- Showed TPA into the continuum is directional, unlike one-photon absorption.
- Attributed directionality to band anisotropies and anisotropic confinement.
Conclusions:
- CdSe nanoplatelets are a new class of directional two-photon absorbers.
- Their properties enable applications in integrated photonic devices and directional photon converters.
Keywords:
2D k-space spectroscopy2D semiconductorsCdSe nanoplateletsangle-dependent two-photon absorptionbright planetransition dipole distribution
