Enhancing ultra-wideband THz fingerprint sensing of unpatterned 2D carbon-based nanomaterials

Ding, Shan; Ou, Jun‐Yu; Du, Liang-Hui; Zhu, Li-Guo; Khan, Sayed Ali; Chen, Huanyang; Zhu, Jinfeng

doi:10.1016/j.carbon.2021.04.084

Cited by 31 publications

(14 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, sweeping the incident angle at very small intervals is not easy to achieve in the actual experiments, and it is also difficult to precisely manufacture different unit cell structures with a thickness of tens of micrometers and a resolution of a few micrometers. 16,17 As one of the important mechanisms for realizing the local electric field, spoof surface plasmon polariton (SSP) on graphene 18 and metal-based metamaterials 19,20 have been diffusely used to detect the refractive index changes of the samples in the terahertz region. Ding et al proposed a thickness-multiplexed method to enhance the terahertz absorption via an evanescent wave.…”

Section: Introductionmentioning

confidence: 99%

“…Ding et al proposed a thickness-multiplexed method to enhance the terahertz absorption via an evanescent wave. 17 In this design, a bulk prism is required to couple the terahertz waves. Niknam et al proposed a metamaterial structure composed of metal stripe unit cells to support the SSP modes with the normal incident of terahertz waves.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Boosting the terahertz absorption spectroscopy based on the stretchable metasurface

Yan

Feng

Yang

et al. 2023

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Boosting the terahertz absorption spectroscopy based on the stretchable metasurface

Yan

Feng

Yang

et al. 2023

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Furthermore, we proposed another critical method based on a basic layered structure made of two un‐patterned layers for excellent THz absorption in an ultra‐thin material layer to get a closer look at the phenomenon of THz detection. [ 33 ] A comprehensive analysis based on coupled‐mode theory demonstrates the physical prerequisites for perfect THz absorption. In addition, the impact of incidence angle, frequency, and dielectric thickness is extensively examined.…”

Section: Introductionmentioning

confidence: 99%

Optical Sensing by Metamaterials and Metasurfaces: From Physics to Biomolecule Detection

Khan

Xie

et al. 2022

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

Optical biosensors are a versatile detection and analysis tool used in biological research, health care, pharmaceuticals, environmental monitoring, homeland security, and the battlefield. [1] They do not interfere with electromagnetic (EM) radiation, manifest distant sensing capability, and may enable multiplexed detection in a single device. Optical biosensing technologies are widely used in current biomedical and environmental monitoring applications because they provide a reliable and quick way to identify and discriminate specific objects from a wide range of samples. [2][3][4][5] More interestingly, Optical biosensors outperform standard analytical techniques by delivering highly-sensitive, selective, and cost-effective real-time and label-free detection of biological and chemical molecules. [6,7] High specificities, sensitivity, small size, and cost-effectiveness are among the benefits.Metasurfaces are planar or 2D forms of metamaterials made up of arrays of antennas with a subwavelength thickness. They have been rapidly developed in the recent years due to their ability to manipulate light-matter interaction in both linear and non-linear regimes at the nanoscale. Various metasurfaces display remarkable optical features, such as acute resonance, significant nearfield enhancement, and suitable capacity to support electric and magnetic modes, on account of the strong light-matter interaction and the low optical loss. Due to these important properties, they can be used in several advanced optoelectronic applications, like surface-enhanced spectroscopy, photocatalysis, and sensing. This review reports on the recent progress of metamaterials and metasurfaces in molecular optical sensors. The principles that govern plasmonic and dielectric metasurfaces along with their features are outlined, supported by numerous examples. Then, the factors that result in a high Q-factor are presented in order to show that metamaterials and metasurfaces can be used for label-free sensing in a variety of detection mechanisms, including surface-enhanced spectroscopy, refractometric sensing, and surface-enhanced thermal emission spectroscopy via infrared absorption and Raman scattering, as well as chiral sensing. Finally, the challenges for future development are outlined.

show abstract

“…[ 1 ] The unique properties of THz radiation have led to numerous applications, such as security screening, [ 2 ] fingerprint spectroscopy analysis, [ 3,4 ] and non‐destructive sensing. [ 5,6 ] By introducing specific wavefronts to conventional THz beams, one can acquire THz special beams, which possess additional optical properties and thus greatly broaden the boundaries of THz technology. So far, the generation and application of THz special beams have attracted extensive research interest in the THz regime.…”

Section: Introductionmentioning

confidence: 99%

Direct Emission of Focused Terahertz Vortex Beams Using Indium‐Tin‐Oxide‐Based Fresnel Zone Plates

Feng

Chen

et al. 2022

Advanced Optical Materials

View full text Add to dashboard Cite

For example, on account of the diffraction limit, the resolutions of the conventional THz imaging systems are usually limited to the sub-millimeter scale, [11,12] however, the hollow feature of the THz vortex beams provides a way to break through the limit and help achieve super-resolution imaging. [8,13] In addition, THz vortex beams are also promising in high-capacity communications as they can increase spatially multiplexing channels based on the orthogonality of the vortex beams with different orbital angular momenta (OAMs). [14,15] Up to now, many methods have been developed to generate THz vortex beams by introducing wavefront control devices into the THz beam path, such as phase plates [13,16,17] and metasurfaces. [18][19][20] However, these were all implemented under the condition of an existing THz beam. Namely, two separate devices, i.e., one for THz generation and the other for vortex wavefront manipulation are required. If the two functionalities can be integrated into a single THz device, then a higher degree of integration is achieved. Currently, several methods have been reported that can directly emit THz vortex beams by designing the nonlinear effects in nonlinear crystals [21,22] and metasurfaces. [7] However, dual-pump condition and the state-of-the-art nanofabrication are respectively required, which increase the complexity and cost in device implementation. Thus, seeking an easy-to-fabrication, low-cost and high-level integration method for THz vortex beam emission is urgently demanded.In our previous work, we demonstrated that an ultrathin indium tin oxide (ITO) film, a very common electrode material, could emit broadband THz waves under an oblique pump of infrared femtosecond laser (IR-Pump). [23] By combing it with an axicon, we demonstrated a direct THz vector Bessel beam emitter. [24] In this work, we experimentally demonstrate that such an ITO film can also be applied to directly emit focused THz vortex beams when it is patterned following the designing concept of a Fresnel zone plate, denoted as ITO-FZP. Three ITO-FZPs that can emit focused THz vortex beams with OAMs of l = 0, +1, and +2 are proposed, as schematically illustrated in Figure 1a. The calculated and measured results show very good consistence with the expectation. The proposed ITO-FZPs are low-cost and easy to fabricate, which is promising in building compact THz systems for vortex beam generation and applications. Terahertz (THz) vortex beams with helical wavefronts promise many important applications ranging from high-speed wireless communications to superresolution imaging. Conventional methods to generate THz beams mostly rely on manipulating and converting the incident THz beams. Herein is proposed and experimentally demonstrated how the patterned indium tin oxide (ITO) film, i.e., ITO Fresnel zone plate (ITO-FZP), enables direct emission of focused THz vortex beams with desired orbital angular momentums. Such THz vortex-beam emitters are based on the straightforward nonlinear THz emission through the patterned ITO fi...

show abstract

Enhancing ultra-wideband THz fingerprint sensing of unpatterned 2D carbon-based nanomaterials

Cited by 31 publications

References 41 publications

Boosting the terahertz absorption spectroscopy based on the stretchable metasurface

Boosting the terahertz absorption spectroscopy based on the stretchable metasurface

Optical Sensing by Metamaterials and Metasurfaces: From Physics to Biomolecule Detection

Direct Emission of Focused Terahertz Vortex Beams Using Indium‐Tin‐Oxide‐Based Fresnel Zone Plates

Contact Info

Product

Resources

About