反向设计的无周期性多层完美吸收器用于中红外线,可实现调性可切换性和角强度
Masoumeh Nazari1, Yaser M Banad1, Sarah Sharif2
1The School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK, 73019, USA.
Scientific reports
|May 21, 2025
概括
我们开发了可调节的石墨烯完美吸收中红外光的吸收器. 这些紧型设备提供超过99.9%的效率,并且可以通过电来切换,从而推进光学传感技术.
科学领域:
- 纳米光子学 纳米光子学
- 材料科学 材料科学 材料科学
- 红外光谱学 红外光谱学
背景情况:
- 中红外 (3-5μm) 频谱对于大气透明度和传感应用至关重要.
- 现有的完美吸收器往往缺乏可调性,可扩展性,或需要复杂的制造.
- 石墨烯的独特电子特性为可调节光学设备提供了潜力.
研究的目的:
- 设计和演示用于中红外光谱的反向设计的无周期性多层石墨烯基完美吸收器.
- 为了在这些吸收器中实现精确的光谱调性和电转换性.
- 为下一代光学设备开发一个可扩展和高效的平台.
主要方法:
- 使用混合微基因逆向设计算法.
- 采用固定的材料序列 (石墨烯,PPSU,PbSe,金基板) 与层厚度变化用于光谱控制.
- 通过调节石墨烯的化学潜力来证明电调性.
主要成果:
- 使用五层石墨烯,在一个紧的~2μm堆中实现了>99.9%的吸收效率.
- 通过层厚度调整 (0.25μm步骤) 证明了精确的光谱调性.
- 展示了用于吸收振幅控制和波长红移的电气切换能力.
- 在高达52°的冲击角度保持了>90%的吸收率,表明了广角强度.
结论:
- 拟议的基于石墨烯的吸收器在尺寸,重量,功率和成本方面具有显著的优势.
- 反向设计方法使波长特定设备的可扩展制造成为可能.
- 这项工作为先进的中红外光学设备和传感应用提供了一个多功能和高效的平台.
相关概念视频
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
262
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
262
IR Spectrometers
1.1K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.1K
IR Spectrum
887
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
887
Infrared (IR) Spectroscopy: Overview
1.4K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
1.4K
IR Frequency Region: Fingerprint Region
688
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
688


