ACS Photonics

Journal Article

Robustness of Momentum-Indirect Interlayer Excitons in MoS2/WSe2 Heterostructure against Charge Carrier Doping

Khestanova, Ekaterina; Ivanova, Tatyana; Gillen, Roland; D’Elia, Alessandro; Gallego Lacey, Oliver Nicholas;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01930

Monolayer transition-metal dichalcogenide (TMD) semiconductors exhibit strong excitonic effects and hold promise for optical and optoelectronic applications. Yet, electron doping of TMDs leads to the conversion of neutral excitons into negative trions, which recombine predominantly...

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Journal Article

Large Numerical Aperture Metalens with High Modulation Transfer Function

Zhang, Jian; Dun, Xiong; Zhu, Jingyuan; Zhang, Zhanyi; Feng, Chao;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c02029

Large numerical aperture (NA) lenses with high modulation transfer functions (MTFs) promise high image resolution for advanced optical imaging. However, it is challenging to achieve a high MTF using traditional large-NA lenses, which are fundamentally limited by the amplitude mismatch. In...

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Journal Article

Transmission-Matrix Quantitative Phase Profilometry for Accurate and Fast Thickness Mapping of 2D Materials

Nie, Yujie; Zhou, Nansen; Tao, Li; Zhu, Jinlong; Gao, Zhaoli;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01795

The physical properties of two-dimensional (2D) materials may drastically vary with their geometric thickness profiles. Current thickness profiling methods for 2D materials are limited in measurement throughput and accuracy. Here, we present a novel high-speed and high-precision thickness...

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Journal Article

In Operando Quantification of Single and Multiphoton Photocurrents in GaP and InGaN Photodetectors with Phase-Modulated Femtosecond Light Pulses

Wang, Chuanliang; Cai, Jinyang; Liu, Xiaoqi; Chen, Chunfeng; Chen, Xiaoke;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01851

Single and multiphoton absorptions in wide band gap semiconductors determine the functionality of photodetectors, lasers, and light-emitting diodes (LEDs). Although electronic structure strongly influences the different orders of multiphoton absorptions in semiconductors, it has not been...

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Journal Article

Label-Free Analysis of Organelle Interactions Using Organelle-Specific Phase Contrast Microscopy (OS-PCM)

Fang, Jingde; Zhang, Hao; Pan, Yang; Smith, Zachary J.; Chu, Kaiqin

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01782

Organelles are highly dynamic and fulfill their function by constant motion and cooperation with each other. Current methods rely on fluorescence, leading to short observation time (via photobleaching) and experimental complexity (via multiple labeling). While label-free microscopes promise a...

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Journal Article

Design and Tuning of Substrate-Fabricated Dielectric Metasurfaces Supporting Quasi-Trapped Modes in the Infrared Range

Prokhorov, Alexei V.; Novikov, Sergey M.; Gubin, Mikhail Yu.; Shesterikov, Alexander V.; Evdokimov, Pavel;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01842

Optical metasurfaces supporting resonances of trapped modes allow obtaining narrow features in their reflection and transmission spectra and are the technological basis for the fabrication of highly sensitive sensor coatings and near-field pumping systems for two-dimensional lasers. In the...

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Journal Article

Terahertz Nonlinear Ghost Imaging via Plane Decomposition: Toward Near-Field Micro-Volumetry

Olivieri, Luana; Peters, Luke; Cecconi, Vittorio; Cutrona, Antonio; Rowley, Maxwell;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01727

Terahertz time-domain imaging targets the reconstruction of the full electromagnetic morphology of an object. In this spectral range, the near-field propagation strongly affects the information in the space–time domain in items with microscopic features. While this often represents a challenge,...

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Journal Article

Ultrafast Carbon Nanotube Photodetectors with Bandwidth over 60 GHz

Wu, Weifeng; Yang, Fan; Fang, Xiansong; Cai, Xiang; Liu, Xiaohui;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01626

The future interconnect links in intra- and interchip require a photodetector with high bandwidth, ultrawide waveband, compact footprint, low cost, and compatible integration process with silicon complementary metal–oxide–semiconductor (CMOS) technology. Here, we demonstrate a CMOS-compatible...

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Journal Article

Ultrafast Heat Transfer at the Nanoscale: Controlling Heat Anisotropy

Bryche, Jean-François; Vega, Marlo; Moreau, Julien; Karsenti, Paul-Ludovic; Bresson, Paul;

2023 ACS Photonics

doi:10.1021/acsphotonics.2c01968

Thermoplasmonics has benefited from increasing attention in recent years by exploiting the photothermal effects within plasmonic nanoparticles to generate nanoscale heat sources. Recently, it has been demonstrated that exciting gold nanoparticles with ultrashort light pulses could be used to...

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Journal Article

Ideal Phase-Free Wave Propagation in Air Channel

Wei, Guochao; Zhou, Xiaoxi; Liu, Zhenzhen; Liu, Xiangli; Hou, Bo;

2023 ACS Photonics

doi:10.1021/acsphotonics.3c00049

Despite many intriguing approaches to realize zero-index media by metamaterial, a more common and attractive way to observe phase-invariant phenomenon at finite frequency is actually by the photonic waveguide mode at the cutoff frequency, which can reside in air channel surrounded by photonic...

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