Graphene assisted terahertz metamaterials for sensitive bio-sensing

Lee, Sang-Hun; Choe, Jong-Ho; Kim, Chulki; Bae, Sukang; Kim, Jin-Soo; Park, Q-Han; Seo, Minah

doi:10.1016/j.snb.2020.127841

Cited by 91 publications

(42 citation statements)

References 50 publications

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“…Surface plasmon resonance (SPR) dramatically enhances the local electric fields and has been used to enhance the performance of graphene coupled devices in the terahertz (THz) and infra-red range (IR) 8 , 9 . Other examples of SPR enhanced graphene devices include photon detectors, gas sensors, and DNA sensors 10 , 11 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced ultraviolet absorption in graphene by aluminum and magnesium hole-arrays

Cheng

Wang

2021

Sci Rep

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Optoelectronic devices in the UV range have many applications including deep-UV communications, UV photodetectors, UV spectroscopy, etc. Graphene has unique exciton resonances, that have demonstrated large photosensitivity across the UV spectrum. Enhancing UV absorption in graphene has the potential to boost the performance of the various opto-electronic devices. Here we report numerical study of UV absorption in graphene on aluminum and magnesium hole-arrays. The absorption in a single-layer graphene on aluminum and magnesium hole-arrays reached a maximum value of 28% and 30% respectively, and the absorption peak is tunable from the UV to the visible range. The proposed graphene hybrid structure does not require graphene to be sandwiched between different material layers and thus is easy to fabricate and allows graphene to interact with its surroundings.

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Section: Introductionmentioning

confidence: 99%

Enhanced ultraviolet absorption in graphene by aluminum and magnesium hole-arrays

Cheng

Wang

2021

Sci Rep

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“…Antireflection coating or signal selector played as critical components to reduce glare and light reflection loss regarding modern optic or optoelectronic systems for better optical clarity in camera lens, display screen, glasses lens, and the glass cover of photovoltaic solar cells. [ 41–45 ] Manufacturers of LCD, cathode‐ray tubes, and aerospace sensor products often added antireflection coating [ 41 ] to optical parts for prolonging service life. However, traditional methods sacrificed shape controlling ability such as spin‐coating, vacuum evaporation, etc.…”

Section: Resultsmentioning

confidence: 99%

“…However, traditional methods sacrificed shape controlling ability such as spin‐coating, vacuum evaporation, etc. [ 42 ] In literature, the impedance matching layers of metal coating, [ 43 ] vanadium dioxide films, [ 44,45 ] or using graphene [ 46 ] was reliable only in a narrow band (<0.8 THz). Worse, the 2D materials generally lacked the self‐supporting ability for complex structures.…”

Section: Resultsmentioning

confidence: 99%

Multiprocess Laser Lifting‐Off for Nanostructured Semiconductive Hydrogels

Tao

Deng

Long

et al. 2021

Adv Materials Inter

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Semiconductive hydrogels denote a strategically valuable platform associated with interdiscipline fields by double advantages of metals and organisms (eco‐friendliness, structural flexibility, mixed conduction, real‐time responsiveness, scalable fabrication, and chemical stability). Nevertheless, the orthodox chemical/physical methods processing hydrogels yield planar‐like layers or rough structures without ultrafine feature size or manipulative performance, falling short of µ‐robotics, µ‐electronics, or n‐energy industries. Thereby, scaling the device's volume down and unleashing material's potential become crucially important for broadband applications. A femtosecond laser lifting‐off technique is synthesized with self‐assembly to break conventional volume/resolution limitation, enlarge the geometry‐design capacity, and desirable electricity conduction for micro/nanosituations. Low‐dimensional high‐performance nanowires, electric circuits, ultrathin interdigital capacitors, manipulative photon filters, and metasurfaces are functionalized here. The repeated experiment concludes a high‐density integration ability with a subminiature size down to 10 × 10 × 0.02 µm3, tunable electric conductivity up to 1.17 × 105 S m−1, and areal capacitance >16.2 mF cm−2 for energy storage higher than those electrochemical double‐layer ones. Large geometry capacity with nanometric resolution provides access to future‐perspective optoelectronic products, n‐energy, bioneural recordings, or interfaces of embedding conditions.

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“…In 2019, Xu et al proposed a graphenemetamaterial heterostructure platform which can detect trace amount of chlorpyrifos methyl down to 0.2 ng [45]. In 2020, Lee et al reported a graphene-combined nanoslot-based terahertz (THz) resonance metamaterial to detect single-stranded deoxyribonucleic acids (ssDNAs) [46]. A maximum relative THz transmittance change of 52% was observed with different types of ssDNA, with the detection limit of nmon/mm 2 .…”

Section: Treatment Of Biomedical Samplementioning

confidence: 99%

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

et al. 2020

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With the non-ionizing, non-invasive, high penetration, high resolution and spectral fingerprinting features of terahertz (THz) wave, THz spectroscopy has great potential for the qualitative and quantitative identification of key substances in biomedical field, such as the early diagnosis of cancer, the accurate boundary determination of pathological tissue and non-destructive detection of superficial tissue. However, biological samples usually contain various of substances (such as water, proteins, fat and fiber), resulting in the signal-to-noise ratio (SNR) for the absorption peaks of target substances are very small and then the target substances are hard to be identified. Here, we present recent works for the SNR improvement of THz signal. These works include the usage of attenuated total reflection (ATR) spectroscopy, the fabrication of sample-sensitive metamaterials, the utilization of different agents (including contrast agents, optical clearing agents and aptamers), the application of reconstruction algorithms and the optimization of THz spectroscopy system. These methods have been proven to be effective theoretically, but only few of them have been applied into actual usage. We also analyze the reasons and summarize the advantages and disadvantages of each method. At last, we present the prospective application of THz spectroscopy in biomedical field.

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Graphene assisted terahertz metamaterials for sensitive bio-sensing

Cited by 91 publications

References 50 publications

Enhanced ultraviolet absorption in graphene by aluminum and magnesium hole-arrays

Enhanced ultraviolet absorption in graphene by aluminum and magnesium hole-arrays

Multiprocess Laser Lifting‐Off for Nanostructured Semiconductive Hydrogels

Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement

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