Rectangular plasmonic interferometer for high sensitive glycerol sensor

Khajemiri, Z.; Lee, Dukhyung; Hamidi, Seyedeh Mehri; Kim, Dai‐Sik

doi:10.1038/s41598-018-37499-2

Cited by 14 publications

(9 citation statements)

References 43 publications

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“…Metal structures such as nanotip, nanoantennas, and nanoslit and slot antennas have been of great research interest over the past two decades because of their potentials and functionalities for a broad range of applications such as chemistry, biology, and medical applications, as well as from basic research aspects [24,[51][52][53][54][55][56][57][58][59][60][61][62][63][64]. Strong field enhancement and confinement obtained at the subwavelength volume are the main resultant properties from interaction between electromagnetic waves and metal nanostructure, which are essential for nonlinear optics in nanoscale.…”

Section: Terahertz Field Enhancement In Various Metal Structuresmentioning

confidence: 99%

Terahertz quantum plasmonics at nanoscales and angstrom scales

2020

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Through the manipulation of metallic structures, light–matter interaction can enter into the realm of quantum mechanics. For example, intense terahertz pulses illuminating a metallic nanotip can promote terahertz field–driven electron tunneling to generate enormous electron emission currents in a subpicosecond time scale. By decreasing the dimension of the metallic structures down to the nanoscale and angstrom scale, one can obtain a strong field enhancement of the incoming terahertz field to achieve atomic field strength of the order of V/nm, driving electrons in the metal into tunneling regime by overcoming the potential barrier. Therefore, designing and optimizing the metal structure for high field enhancement are an essential step for studying the quantum phenomena with terahertz light. In this review, we present several types of metallic structures that can enhance the coupling of incoming terahertz pulses with the metals, leading to a strong modification of the potential barriers by the terahertz electric fields. Extreme nonlinear responses are expected, providing opportunities for the terahertz light for the strong light–matter interaction. Starting from a brief review about the terahertz field enhancement on the metallic structures, a few examples including metallic tips, dipole antenna, and metal nanogaps are introduced for boosting the quantum phenomena. The emerging techniques to control the electron tunneling driven by the terahertz pulse have a direct impact on the ultrafast science and on the realization of next-generation quantum devices.

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Section: Terahertz Field Enhancement In Various Metal Structuresmentioning

confidence: 99%

Terahertz quantum plasmonics at nanoscales and angstrom scales

2020

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“…The conventional configurations to design optical sensors are based on plasmonic Mach–Zehnder interferometer 51 , plasmonic square ring resonator 52 , plasmonic cross resonator 53 , rectangular plasmonic interferometer 54 , plasmonic triangular resonator 55 , one dimensional porous silicon PC sensor 56 , armchair graphene nano-ribbon 57 , and so on. All aforementioned sensor structures in the literature create conventional spectra like Lorentzian, Fano resonance, and electromagnetically induced transparency (EIT) spectra for sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Optical biosensors using plasmonic and photonic crystal band-gap structures for the detection of basal cell cancer

Khani

Hayati

2022

Sci Rep

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One of the most interesting topics in bio-optics is measuring the refractive index of tissues. Accordingly, two novel optical biosensor configurations for cancer cell detections have been proposed in this paper. These structures are composed of one-dimensional photonic crystal (PC) lattices coupled to two metal–insulator–metal (MIM) plasmonic waveguides. Also, the tapering method is used to improve the matching between the MIM plasmonic waveguides and PC structure in the second proposed topology. The PC lattices at the central part of the structures generate photonic bandgaps (PBGs) with sharp edges in the transmission spectra of the biosensors. These sharp edges are suitable candidates for sensing applications. On the other hand, the long distance between two PBG edges causes that when the low PBG edge is used for sensing mechanism, it does not have an overlapping with the high PBG edge by changing the refractive index of the analyte. Therefore, the proposed biosensors can be used for a wide wavelength range. The maximum obtained sensitivities and FOM values of the designed biosensors are equal to 718.6, 714.3 nm/RIU, and 156.217, 60.1 RIU−1, respectively. The metal and insulator materials which are used in the designed structures are silver, air, and GaAs, respectively. The finite-difference time-domain (FDTD) method is used for the numerical investigation of the proposed structures. Furthermore, the initial structure of the proposed biosensors is analyzed using the transmission line method to verify the FDTD simulations. The attractive and simple topologies of the proposed biosensors and their high sensitivities make them suitable candidates for biosensing applications.

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“…[10,11]. Due to these advantages, research community has focused more on MIM waveguides and devices based on them such as filters, sensors, and lenses [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact plasmonic unidirectional wavelength multiplexer/demultiplexer based on slot cavities

Aparna

Kumar

2022

Opt Rev

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An ultra-compact plasmonic unidirectional wavelength multiplexer/demultiplexer based on slot cavities is proposed and numerically simulated. The structure consists of slot cavities which are etched on either sides of a metal–insulator–metal (MIM) bus waveguide. The cavities capture surface plasmon polariton (SPP) waves at their resonant wavelengths and unidirectionally couples them to the drop waveguide etched parallel to the bus. The structure basically relies on resonance and interference of SPP waves and its functioning is validated through finite element method (FEM) simulations. The simulation results show that the proposed structure functions as expected with a full width at half maximum (FWHM) bandwidth of less than 50 nm, extinction ratio (ER) more than 10 dB, and crosstalk (CT) of less than − 10 dB for the designed wavelengths. The proposed structure holds lot of potential to enhance the miniaturization of ultra-compact integrated photonic circuits for optical signal processing and other related applications.

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Rectangular plasmonic interferometer for high sensitive glycerol sensor

Cited by 14 publications

References 43 publications

Terahertz quantum plasmonics at nanoscales and angstrom scales

Terahertz quantum plasmonics at nanoscales and angstrom scales

Optical biosensors using plasmonic and photonic crystal band-gap structures for the detection of basal cell cancer

Ultra-compact plasmonic unidirectional wavelength multiplexer/demultiplexer based on slot cavities

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