colloidal quantum dot
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2022 ◽  
pp. 2107888
Author(s):  
Qian Zhao ◽  
Rui Han ◽  
Ashley R. Marshall ◽  
Shuo Wang ◽  
Brian M. Wieliczka ◽  
...  

2022 ◽  
Vol 11 (1) ◽  
Author(s):  
Moritz B. Heindl ◽  
Nicholas Kirkwood ◽  
Tobias Lauster ◽  
Julia A. Lang ◽  
Markus Retsch ◽  
...  

AbstractMicroscopic electric fields govern the majority of elementary excitations in condensed matter and drive electronics at frequencies approaching the Terahertz (THz) regime. However, only few imaging schemes are able to resolve sub-wavelength fields in the THz range, such as scanning-probe techniques, electro-optic sampling, and ultrafast electron microscopy. Still, intrinsic constraints on sample geometry, acquisition speed and field strength limit their applicability. Here, we harness the quantum-confined Stark-effect to encode ultrafast electric near-fields into colloidal quantum dot luminescence. Our approach, termed Quantum-probe Field Microscopy (QFIM), combines far-field imaging of visible photons with phase-resolved sampling of electric waveforms. By capturing ultrafast movies, we spatio-temporally resolve a Terahertz resonance inside a bowtie antenna and unveil the propagation of a Terahertz waveguide excitation deeply in the sub-wavelength regime. The demonstrated QFIM approach is compatible with strong-field excitation and sub-micrometer resolution—introducing a direct route towards ultrafast field imaging of complex nanodevices in-operando.


Small ◽  
2022 ◽  
Vol 18 (1) ◽  
pp. 2270005
Author(s):  
Mingyu Li ◽  
Shiwu Chen ◽  
Xinzhao Zhao ◽  
Kao Xiong ◽  
Bo Wang ◽  
...  

Author(s):  
Yufei Zhong ◽  
Ahmad R. Kirmani ◽  
Xinzheng Lan ◽  
Joshua Carpenter ◽  
Annabel Chew ◽  
...  

Conjugated polymers are widely used as photoactive and transport layers in organic and hybrid photovoltaics (PV), where the energetics of polymers are a key design criterion. Here, we show that...


Small ◽  
2021 ◽  
pp. 2105495
Author(s):  
Mingyu Li ◽  
Shiwu Chen ◽  
Xinzhao Zhao ◽  
Kao Xiong ◽  
Bo Wang ◽  
...  

Author(s):  
John P. Philbin ◽  
Amikam Levy ◽  
Prineha Narang ◽  
Wenjie Dou

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