In this paper, we propose a dual-band and spectrally selective infrared (IR) absorber based on a hybrid structure comprising a patterned graphene monolayer and cross-shaped gold resonators within a metasurface. Rooted in full-wave numerical simulations, our study shows that the fundamental absorption mode of the gold metasurface hybridizes with the graphene pattern, leading to a second absorptive mode whose properties depend on graphene's electrical properties and physical geometry. Specifically, the central operation band of the absorber is defined by the gold resonators whereas the relative absorption level and spectral separation between the two modes can be controlled by graphene's chemical potential and its pattern, respectively. We analyze this platform using coupled-mode theory to understand the coupling mechanism between these modes and to elucidate the emergence and tuning of the dual band response. The proposed dual-band device can operate at different bands across the IR spectrum and may open new possibilities for tailored sensing applications in spectroscopy, thermal imaging, and environmental monitoring.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.522046 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
An Efficient and Flexible Bifunctional Dual-Band Electrochromic Device Integrating with Energy Storage.
Nanomicro Lett
December 2024
Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People's Republic of China.
Dual-band electrochromic devices capable of the spectral-selective modulation of visible (VIS) light and near-infrared (NIR) can notably reduce the energy consumption of buildings and improve the occupants' visual and thermal comfort. However, the low optical modulation and poor durability of these devices severely limit its practical applications. Herein, we demonstrate an efficient and flexible bifunctional dual-band electrochromic device which not only shows excellent spectral-selective electrochromic performance with a high optical modulation and a long cycle life, but also displays a high capacitance and a high energy recycling efficiency of 51.
View Article and Find Full Text PDFMechanistic Insights into Dual NIR Emission from Cr-Doped ScO via First-Principles Calculations.
Inorg Chem
December 2024
CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China.
Article Synopsis
- The study investigates the emission properties of Cr-doped ScO phosphor, which emits in two important near-infrared (NIR) bands, useful for spectroscopy and medical applications.
- Through first-principles calculations, it was determined that the NIR-I emission peak at 840 nm is associated with Cr ions at a specific site in the crystal structure, while the broader NIR-II emission at 1280 nm likely involves trace impurities rather than Cr.
- The research highlights the utility of systematic computational approaches in understanding luminescent behaviors of materials, particularly when examining the role of defects and dopants like Cr and Ni.
In this paper, we optimize the amplification efficiency of a nanosecond pulse CO laser in a fast flow amplifier using dual-band and multispectral lines techniques. Utilizing a six-temperature model and a random rotational relaxation model, we simulate the time-domain amplification process of dual-band and multispectral lines short-pulse seeds in a fast flow CO laser amplifier, analyzing the effects of input pulse fluence, pulse width, and spectral line composition on amplification efficiency. Compared to single-line 10P(20) amplification, the extraction efficiency of 10.
View Article and Find Full Text PDFDual-band transparency over near-IR and THz in surfactant-free DNA solid film.
Sci Rep
November 2024
Photonics Device Physics Laboratory, Department of Physics, Yonsei University, Seoul, 120-749, South Korea.
We thoroughly investigated the optical properties of surfactant-free deoxyribonucleic acid (SF-DNA) solid films across a broad spectral gamut from ultraviolet (UV) to terahertz (THz). Demonstrating potential as a transparent dielectric material, SF-DNA films could potentially form optical elements, such as lenses, prisms, and waveguides, for dual-band, near-IR and THz applications. SF-DNA films were classified according to their thickness.
View Article and Find Full Text PDFColorimetric Thermography by a Long-Infrared Dual-Band Metalens.
Adv Sci (Weinh)
January 2025
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Instrumentation, University of Science and Technology of China, Hefei, 230026, China.
Infrared (IR) radiation thermography is extensively utilized in diverse fields due to its non-contact capability. Nevertheless, its effectiveness is often compromised by the significant emissivity variations among different objects, limiting its application to specific setups or focused object types. Colorimetric thermography is introduced as an alternative emissivity-independent method of radiation thermometry.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!