Ultrasensitive Detection of Heavy Metal Ions with Scalable Singular Phase Thin Film Optical Coatings

Rao, A.Ramchander; Sreekanth, Kandammathe Valiyaveedu; Sreejith, Sivaramapanicker; Jose, Vishal; Pethe, Shreyas Dinesh

doi:10.1002/adom.202102623

Cited by 5 publications

(1 citation statement)

References 49 publications

(43 reference statements)

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“…Alternatively, thin-film MAs do not require patterned structures, which conceptually work on the principle of light interference. [133][134][135][136] Because of the lithography-free process, thin-film MAs are capable of operating in optical frequencies, which have demonstrated some novel applications in gas sensing, [134,137] biomolecular sensing, [138,139] chemical sensors, [140] vibrational sensors, [141] and color filters. [136,142] Recently, thin-film MAs with tunable absorption in optical spectrum have also been realized by incorporating an ultrathin layer of PCMs, such as GST.…”

Section: Phase-change Materialsmentioning

confidence: 99%

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

et al. 2022

Advanced Materials

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Since the first demonstration, remarkable progress has been made in the theoretical analysis, structural design, numerical simulation, and potential applications of metamaterial absorbers (MAs). With the continuous advancement of novel materials and creative designs, the absorption of MAs is significantly improved over a wide frequency spectrum from microwaves to the optical regime. Further, the integration of active elements into the MA design allows the dynamical manipulation of electromagnetic waves, opening a new platform to push breakthroughs in metadevices. In the last several years, numerous efforts have been devoted to exploring innovative approaches for incorporating tunability to MAs, which is highly desirable because of the progressively increasing demand on designing versatile metadevices. Here, a comprehensive and systematical overview of active MAs with adaptive and on‐demand manner is presented, highlighting innovative materials and unique strategies to precisely control the electromagnetic response. In addition to the mainstream method by manipulating periodic patterns, two additional approaches, including tailoring dielectric spacer and transforming overall structure are called back. Following this, key parameters, such as operating frequency, relative tuning range, and switching speed are summarized and compared to guide for optimum design. Finally, potential opportunities in the development of active MAs are discussed.

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Section: Phase-change Materialsmentioning

confidence: 99%

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

et al. 2022

Advanced Materials

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Dual‐Phase Singularity at a Single Incident Angle with Spectral Tunability in Tamm Cavities

Sreekanth,

Jana,

et al. 2024

Advanced Materials

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The phase singularity, a sudden phase change occurring at the reflection zero is widely explored using various nanophotonic systems such as metamaterials and thin film cavities. Typically, these systems exhibit a single reflection zero with a phase singularity at a specific incident angle, particularly at larger angles of incidence (>50 degrees). However, achieving multiple phase singularities at a single incident angle remains a formidable challenge. Here, the existence of a dual‐phase singularity is experimentally demonstrated at a lower incident angle using a tunable Tamm plasmon polariton (TPP) cavity that consists of gold‐coated ultralow‐loss phase change material Sb2S3‐based distributed Bragg reflector. It can excite narrowband TPP resonances from normal incidence to a wide angle of incidence for both s‐ and p‐polarizations of light. Notably, this TPP cavity shows dual‐phase singularity at lower angles of incidence since the excited TPP for s‐ and p‐polarizations exhibits zero reflection at slightly different wavelengths for the same incident angle. A TPP cavity‐based scalable hydrogen sensor is proposed and shows that the dual‐phase singularity can further improve the sensitivity of singular phase‐based sensing approaches. Moreover, spectrally tunable dual‐phase singularity is experimentally demonstrated at a lower incident angle using a metal‐free Tamm cavity.

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Highly Absorbing Monolayer MoS₂ for a Large Reflection Phase Modulation

Wang,

Li,

et al. 2024

Advanced Optical Materials

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Manipulation of wavefront lies at the core of next‐generation information technologies. Compared to metal and dielectric metasurfaces, atomic 2D materials exhibit excellent prospects toward fulfilling ultra‐thin thickness requirements in flat optics in wavefront shaping, with thickness much smaller than those of traditional bulky devices. However, phase manipulation by light propagating through atomic 2D materials is suppressed due to its sub‐nanometer thickness. Here, an approach is reported to realize reflection phase singularities by establishing a zero‐reflection point in a monolayer MoS2‐based multilayer system, which broadens topological study beyond polarization singularity. This is achieved through the creation of a multilayer Fabry‐Perot‐type interference, and a pronounced phase change in the reflected light is realized due to the high absorption of monolayer MoS2 in the studied wavelength range. As an application, a rapid, sensitive, and label‐free detection of SARS‐CoV‐2 (2019‐nCov) antigen is demonstrated with a detection limit of 10−12 M L−1 (62 pg ml−1) by using monolayer MoS2 based optical biosensor. In addition to offering a comprehensive study in phase singularity, efficient wavefront engineering based on the reflective system using materials is presented with atomic thickness which may greatly simplify optical architecture in flat optics, and promote its development toward compactness and integrated functions.

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Ultrasensitive Detection of Heavy Metal Ions with Scalable Singular Phase Thin Film Optical Coatings

Cited by 5 publications

References 49 publications

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

Dual‐Phase Singularity at a Single Incident Angle with Spectral Tunability in Tamm Cavities

Highly Absorbing Monolayer MoS₂ for a Large Reflection Phase Modulation

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Ultrasensitive Detection of Heavy Metal Ions with Scalable Singular Phase Thin Film Optical Coatings

Cited by 5 publications

References 49 publications

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

Metamaterial Absorbers: From Tunable Surface to Structural Transformation

Dual‐Phase Singularity at a Single Incident Angle with Spectral Tunability in Tamm Cavities

Highly Absorbing Monolayer MoS2 for a Large Reflection Phase Modulation

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Product

Resources

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Highly Absorbing Monolayer MoS₂ for a Large Reflection Phase Modulation