Terahertz Plasmonic Waveguide Based Thin Film Sensor

Islam, Maidul; Chowdhury, Dibakar Roy; Ahmad, Amir; Kumar, Gagan

doi:10.1109/jlt.2017.2763326

Cited by 36 publications

(17 citation statements)

References 45 publications

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“…Further in the THz frequency range, narrowband plasmonic resonances are utilized to sense the frequency shift due to refractive index change [143][144][145][146] in contrast to the rainbow trapping effect in the IR range which uses SEIRA to detect vibrational mode signatures of the constituent material. Islam et al demonstrated that a corrugated THz waveguide possesses a narrowband plasmonic response which is capable of refractive index sensing.…”

Section: Perspective On New Materials For Broader Wavelength Rangementioning

confidence: 99%

“…Islam et al demonstrated that a corrugated THz waveguide possesses a narrowband plasmonic response which is capable of refractive index sensing. [143] Furthermore, slot antennas with silver nanowires [144] and circular array structures [145] are used to enhance the sensitivity of THz sensors by virtue of their plasmonic effect. In a recent study, rainbow trapping graphene-based waveguides are proposed for bio-sensing and on-chip applications.…”

Section: Perspective On New Materials For Broader Wavelength Rangementioning

confidence: 99%

See 1 more Smart Citation

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Farid

Dixon

Shayegannia

et al. 2021

Advanced Optical Materials

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Surface plasmon polaritons (SPPs) which exist at the metal-dielectric interface are guided by the coupling of electromagnetic waves to oscillations in the electron gas plasma created at metal surfaces. Plasmonics, a subset of the field of nanophotonics pertaining to all things beyond the diffraction limit, has flourished and evolved significantly over the past decade offering practical utility to a variety of applications. [1] Notwithstanding the ohmic loss in metals and commensurate limited propagation lengths of SPPs, the ability to effectively concentrate light in nanoscale volumes and generate extremely high electric field intensities at discontinuities or subwavelength patterned surfaces offers unique opportunities to enhance lightmatter interactions for a diverse range of functionalities. [2] Trapping broadband electromagnetic radiation over a range of deep subwavelength guided modes in a given structure provides opportunities for light-matter interactions at the nanoscale. Use of materials-commonly metals-that exhibit negative dielectric permittivity (ε < 0) at optical frequencies provide an optimum solution for light localization. Nanometallic light concentrators, in contrast to their dielectric counterparts, can squeeze and localize light into subwavelength volumes with greater control and higher efficiency. [3] Such plasmonic light concentration can be achieved by either resonant or non-resonant structures. In resonant structures, SPPs are created by time-varying electric fields that exert a force on the negatively charged electron gas inside a metal. These oscillations are resonantly driven leading to a strong charge displacement at specific optical frequencies and concentration of the light field within the structures. [4] For non-resonant light concentration effects, Schuller et al. demonstrated subwavelength light localization by introducing a feed gap in the metal structure for retardation-based resonators. The gap builds up opposite charges across it whereby SPPs encounter a longitudinal electric field component causing strong sub-wavelength light localization. [2] The focus of this article is plasmonic devices that enable rainbow light trapping, a specific modality of nanoscale field enhancement in which trapped light is spatially separated This article presents recent advances in plasmonic multiwavelength rainbow light trapping, a field that has evolved over the last decade and today is an active area of research interest encompassing a manifold of potential applications which include optical biosensing, photodetection, spectroscopy, and medicine. Conventional plasmonic devices are designed and optimized to enhance optical performance at single wavelengths, and as such are not suitable for applications that require electromagnetic field localization at multiple frequencies or broad frequency ranges of interest. To overcome these limitations, the ability to slow and trap light at multiple wavelengths and at different spatial locations has attracted significant scientific attention and opened up n...

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Section: Perspective On New Materials For Broader Wavelength Rangementioning

confidence: 99%

Section: Perspective On New Materials For Broader Wavelength Rangementioning

confidence: 99%

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Farid

Dixon

Shayegannia

et al. 2021

Advanced Optical Materials

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“…Furthermore, broadband MIM waveguides with low side lobes were proposed as an alternative to create Bragg gratings for coupling with optical fibers in telecommunication systems [16]. Metallic plasmonic slits used for the design of nanoscale devices with near-field applications have been demonstrated in the fact [17] because MIM waveguides can trap light with an acceptable length for SPP propagation [10]. Based on the MIM waveguide architecture, recently, several wavelength-selective devices have been proposed and investigated, e.g.…”

Section: Introductionmentioning

confidence: 99%

Triple-wavelength filter based on the nanoplasmonic metal-insulator-metal waveguides

et al. 2021

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In this paper, we present a proposal for compact photonic wavelength filtering and 3-dB wavelength splitting device based on nanoplasmonic metal-insulator-metal structure. The working performance of the device has been accurately simulated using the temporal coupled-mode theory. We use a numerical simulation method of eigenmode expansion propagation for the overall design process. We show that the transmission efficiency of the drop filter can be significantly enhanced by applying specifically optimization of nanostub waveguide. The proposed structure has potential applications in highly efficient ultracompact integration circuits as well as in optical communication systems at nanoscale.

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“…Due to the evolution of these devices in the mid-1980s, however, terahertz radiation has attracted much more attention. Since this part of the spectrum is between the infrared (IR) and microwave frequency ranges, the development of waveguides [1][2][3][4][5][6], filters [7,8], polarizers [9,10], lenses [11,12], and other optical components benefits from the well-established technologies [13][14][15]. The characteristic of terahertz waves to penetrate most dielectric materials offers the possibility of many applications.…”

Section: Introductionmentioning

confidence: 99%

3D Printed Hollow-Core Terahertz Fibers

Cruz

Cordeiro

Franco

2018

Fibers

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This paper reviews the subject of 3D printed hollow-core fibers for the propagation of terahertz (THz) waves. Several hollow and microstructured core fibers have been proposed in the literature as candidates for low-loss terahertz guidance. In this review, we focus on 3D printed hollow-core fibers with designs that cannot be easily created by conventional fiber fabrication techniques. We first review the fibers according to their guiding mechanism: photonic bandgap, antiresonant effect, and Bragg effect. We then present the modeling, fabrication, and characterization of a 3D printed Bragg and two antiresonant fibers, highlighting the advantages of using 3D printers as a path to make the fabrication of complex 3D fiber structures fast and cost-effective.

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Terahertz Plasmonic Waveguide Based Thin Film Sensor

Cited by 36 publications

References 45 publications

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Rainbows at the End of Subwavelength Discontinuities: Plasmonic Light Trapping for Sensing Applications

Triple-wavelength filter based on the nanoplasmonic metal-insulator-metal waveguides

3D Printed Hollow-Core Terahertz Fibers

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