Enhanced infrared photoresponse induced by symmetry breaking in a hybrid structure of graphene and plasmonic nanocavities

Guo, Shangkun; Zhang, Donghai; Zhou, Jing; Deng, Jie; Yu, Yu; Deng, Jing‐Fa; Cai, Qing-Yuan; Li, Zhifeng; Lü, Wei; Chen, Xiaoshuang

doi:10.1016/j.carbon.2020.08.035

Cited by 20 publications

(10 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To control the Seebeck coefficient, fabrication of a p – n junction through material doping or electrical gating can be employed to generate an asymmetric Seebeck coefficient, while such methods generally lead to complex device structures. − The asymmetric metal contact with a large work function difference can also induce an asymmetric Seebeck coefficient, while inevitably introduce additional contact resistance to the system simultaneously. − To generate a high temperature gradient, another widely used strategy is through localized illumination by focusing the light beam. , However, this strategy will be limited by the diffraction limit and is unpractical for an LWIR detector with sub-wavelength-scale dimensions. In addition, the temperature gradient can also be realized by nonuniform light absorption through localized optical absorption enhancement elements, such as plasmonic structures, antennas, nanocavities, and optical gratings. − All strategies listed above need complex and/or sophisticated fabrication progresses, as well as high wavelength selectivity designs because of their specific optical resonances. These are undesirable for achieving a broadband photoresponse, which is one of the main advantages of PTE-based detectors.…”

mentioning

confidence: 99%

High-Performance, Polarization-Sensitive, Long-Wave Infrared Photodetection via Photothermoelectric Effect with Asymmetric van der Waals Contacts

Dai

Wang

et al. 2022

ACS Nano

View full text Add to dashboard Cite

Long-wavelength infrared (LWIR) photodetection is important for heatseeking technologies, such as thermal imaging, all-weather surveillance, and missile guidance. Among various detection techniques, photothermoelectric (PTE) detectors are promising in that they can realize ultra-broadband photodetection at room temperature without an external power supply. However, their performance in terms of speed, responsivity, and noise level in the LWIR regime still needs further improvement. Here, we demonstrated a high-performance PTE photodetector based on low-symmetry palladium selenide (PdSe 2 ) with asymmetric van der Waals contacts. The temperature gradient induced by asymmetric van der Waals contacts even under global illumination drives carrier diffusion to produce a photovoltage via the PTE effect. A responsivity of over 13 V/W, a response time of ∼50 μs, and a noise equivalent power of less than 7 nW/Hz 1/2 are obtained in the 4.6−10.5 μm regime at room temperature. Furthermore, due to the anisotropic absorption of PdSe 2 , the detector exhibits a linear polarization angle sensitive response with an anisotropy ratio of 2.06 at 4.6 μm and 1.21 at 10.5 μm, respectively. Our proposed device architecture provides an alternative strategy to design high-performance photodetectors in the LWIR regime by utilizing van der Waals layered materials.

show abstract

mentioning

confidence: 99%

High-Performance, Polarization-Sensitive, Long-Wave Infrared Photodetection via Photothermoelectric Effect with Asymmetric van der Waals Contacts

Dai

Wang

et al. 2022

ACS Nano

View full text Add to dashboard Cite

show abstract

“…Furthermore, as the Fermi level of graphene can be changed by applying a biased voltage, it provides an active and controllable method to tune the microwave absorption, absorption bandwidth, and modulation depth of the MGSS. [ 55–57 ] As shown in Figure S6, Supporting Information, the calculated peak absorption of the MGSS varied at different Fermi levels, and a bandwidth of over‐90% absorption can also be improved.…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Transparent Broadband Microwave Absorbers

Wang

Zhang

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

The ability to absorb a broad frequency range of microwaves is essential for improving the performance of various electromagnetic interference shielding applications. However, the achievement of broadband microwave absorption with high optical transparency remains a long‐standing and unsolved challenge. Here, a simple and powerful method for high‐efficiency broadband microwave absorption is presented by introducing strongly overlapped multi‐cavity resonances, which is supported by multi‐layer structures comprising of alternating graphene/silica pairs and ultrathin silver films. A design guideline for achieving broadband absorption in multi‐layer structures is proposed and, more importantly, the complementary effect of different graphene layers on the microwave absorption mechanism is revealed for the first time, providing a new analytical perspective. Experiments show that the absorption efficiency of the proposed multi‐layer structures is near unity (≈100%) at resonant peaks with absorption bandwidths (≥50%) up to ≈30 GHz within the measured range of 32 GHz. In addition, the multi‐layer structures exhibit highly visible transmittance ranging from ≈85.8% to 68.0%. The proposed general theoretical framework and physical insights in combination with experimental demonstrations lay the foundation for designing a new type of transparent broadband microwave absorber.

show abstract

“…The photo-induced bond cleavage between the xanthene and phenyl group of a single rhodamine B isothiocyanate molecule is studied by combining Raman and fluorescence signals ( Figure 17 b). In addition, recently enhancements of the intensity of graphene Raman phonons and of graphene absorption have been reported when located in plasmonic nanocavities [ 136 , 137 ].…”

Section: Fluorescence Enhancement and Imagingmentioning

confidence: 99%

Raman and Fluorescence Enhancement Approaches in Graphene-Based Platforms for Optical Sensing and Imaging

2021

View full text Add to dashboard Cite

The search for novel platforms and metamaterials for the enhancement of optical and particularly Raman signals is still an objective since optical techniques offer affordable, noninvasive methods with high spatial resolution and penetration depth adequate to detect and image a large variety of systems, from 2D materials to molecules in complex media and tissues. Definitely, plasmonic materials produce the most efficient enhancement through the surface-enhanced Raman scattering (SERS) process, allowing single-molecule detection, and are the most studied ones. Here we focus on less explored aspects of SERS such as the role of the inter-nanoparticle (NP) distance and the ultra-small NP size limit (down to a few nm) and on novel approaches involving graphene and graphene-related materials. The issues on reproducibility and homogeneity for the quantification of the probe molecules will also be discussed. Other light enhancement mechanisms, in particular resonant and interference Raman scatterings, as well as the platforms that allow combining several of them, are presented in this review with a special focus on the possibilities that graphene offers for the design and fabrication of novel architectures. Recent fluorescence enhancement platforms and strategies, so important for bio-detection and imaging, are reviewed as well as the relevance of graphene oxide and graphene/carbon nanodots in the field.

show abstract

Enhanced infrared photoresponse induced by symmetry breaking in a hybrid structure of graphene and plasmonic nanocavities

Cited by 20 publications

References 47 publications

High-Performance, Polarization-Sensitive, Long-Wave Infrared Photodetection via Photothermoelectric Effect with Asymmetric van der Waals Contacts

High-Performance, Polarization-Sensitive, Long-Wave Infrared Photodetection via Photothermoelectric Effect with Asymmetric van der Waals Contacts

High‐Performance Transparent Broadband Microwave Absorbers

Raman and Fluorescence Enhancement Approaches in Graphene-Based Platforms for Optical Sensing and Imaging

Contact Info

Product

Resources

About