Integrated Optical Filters with Hyperbolic Metamaterials

Abdulkareem, Mas-ud A.; López-Rayón, Fernando; Sosa-Sánchez, Citlalli Teresa; González, Ramsés E. Bautista; Carrasco, M. L. Arroyo; Peña-Gomar, Marycarmen; Coello, Víctor; Tellez-Limon, Ricardo

doi:10.3390/nano13040759

Cited by 4 publications

(1 citation statement)

References 51 publications

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“…Additionally, the HMM PtC waveguide sensor is both compact and efficient. Note that the operational wavelength of the suggested sensor is adjustable [51]. Altering the structural parameters can lead to modifications in the transmission spectrum of the HMM PtC waveguide.…”

Section: Resultsmentioning

confidence: 99%

Photonic Crystal Waveguides Composed of Hyperbolic Metamaterials for High-FOM Nano-Sensing

Zheng,

Khan,

Asrafali

et al. 2023

Crystals

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This study introduces an innovative integration of hyperbolic metamaterials (HMMs) and photonic crystals (PtCs), each possessing unique dispersion properties that effectively manipulate the propagation of light. We present a PtC waveguide consisting of arrays of HMM nanorods, denoted as HMM PtCs. This waveguide configuration enables the realization of a high figure of merit (FOM) nano-sensor. HMMs and PtCs share the same underlying physics. HMMs can generate surface plasmonics, while PtCs offer a bandgap for the waveguide. This configuration presents a novel sensing solution that directly couples surface plasmonics and waveguide modes. By modifying the refractive indices of the surrounding materials, the PtC waveguide exhibits alterations in absorption and transmission, allowing for the detection of temperature, pressure, and material variations. The refractive indices of the surrounding materials can be adjusted based on the sensor’s intended application. For instance, when the sensor is utilized for temperature sensing, thermal infrared materials can serve as the surrounding medium. As the temperature rises, the refractive index of the surrounding material changes accordingly, impacting the waveguide modes and thereby altering absorption and transmission. We utilized the finite element method to conduct numerical simulations in order to assess the absorption and transmission characteristics of the proposed system. Given that this approach involves a full electromagnetic calculation based on Maxwell’s equations, it closely approximates real-world scenarios. The employed numerical method demonstrates the remarkable performance of this proposed system, achieving a sensitivity of 324.16 nm/RIU (refractive index unit) and an impressive FOM of 469.58 RIU−1. These results signify a substantial improvement over surface plasmonic sensors, which typically exhibit limited FOMs. The direct coupling between surface plasmonics and waveguide modes provides a distinct advantage, allowing the proposed sensor to deliver a superior performance. As a consequence, the HMM PtC waveguide sensor emerges as an exceptionally appealing option for photonic sensing applications. The complexity of the proposed system presents a fabrication challenge. Nevertheless, as fabrication technology continues to advance, we anticipate that this issue can be effectively resolved. The proposed HMM PtC waveguide holds vast potential across diverse fields, including biology, medicine, and clinics, representing an exciting advancement for both industry and scientific research.

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Section: Resultsmentioning

confidence: 99%

Photonic Crystal Waveguides Composed of Hyperbolic Metamaterials for High-FOM Nano-Sensing

Zheng,

Khan,

Asrafali

et al. 2023

Crystals

View full text Add to dashboard Cite

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Graphene Oxides as Epsilon‐Near‐Zero Platforms Operating in Terahertz Frequency Range

Jun,

Yim,

Park

et al. 2023

Laser & Photonics Reviews

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Epsilon‐near‐zero (ENZ) materials, with their unique light manipulation capabilities, have fascinating applications such as cloaking, super‐resolution imaging, energy harvesting, and sensing. Herein, free‐standing graphene oxide films are fabricated whose dielectric constant can be engineered by thermal reduction, resulting in ENZ characteristics at the transition between insulating and metallic phases. The ENZ frequency is found to be 0.4–0.5 THz under an annealing temperature of 200 °C, whereas another ENZ phase appeared at 360 °C. ENZ film can be transferred to curved metal surfaces, serving as superabsorbers that suppress wave reflection from underneath metal surfaces. Hyper‐resolution in nondestructive THz imaging is also possible, owing to superior beaming. Spatial resolution is improved two‐fold by adding the ENZ film, even when the metal pattern is enclosed by a paint layer. Lastly, hybrid sensors are developed by incorporating the meta‐pattern on the free‐standing ENZ substrate. The energy splitting of metamaterial resonance originating from the coupling with ENZ mode is observed. Hybridized devices have proven effective in detecting microorganisms with a low refractive index, owing to the unique dielectric configuration offered by ENZ material. Using the novel ENZ platform, a 15‐fold improvement in microbial sensitivity is achieved compared with the conventional sensors.

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Forward and backward propagation guided-mode waves of electric dipole resonances in an h-BN metasurface

Zhou,

Jin,

Zhao

et al. 2023

J. Opt. Soc. Am. B

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The generation of a backward propagation (BP) and forward propagation (FP) guided mode in a double ridge h-BN metasurface (DRM) is investigated. h-BN is a hyperbolic metamaterial with two Reststrahlen frequency bands (RBs). The incident wave can excite guided modes in DRM, where the Poynting vector parallel component of the FP mode is identical and the BP mode is opposite to that of the incident wave. Based on the optimized structure, the frequency range of the BP mode for TE waves was found near the type II hyperbolic band (HB II), while for TM waves, it was found in the gap between the range of HB I and HB II in h-BN. To comprehensively understand the physics underlying BP and FP modes, we present the electric and magnetic field intensities in DRM, the electric field profile of beam steering, and the radiated powers of multipole resonances. The electric dipole (ED) moment contributes most significantly to the FP and BP modes, with its power being much greater than that of other multipolar moment modes. A proportion of BP mode power and incident power decreases with increasing incident angle of TE waves. There are two peaks of the proportion with TM waves. The maximum proportion is near 75% ofTE waves and 16% ofTM waves. The DRM has shown promising potential in the field of sensors based on BP mode, with a sensitivity of 3.9675 µm/RIU of TE waves and 5.1479 µm/RIU of TM waves. These findings suggest that DRMs hold significant promise for the development of optical metasurfaces, optical switches, and high-performance sensors.

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Integrated Optical Filters with Hyperbolic Metamaterials

Cited by 4 publications

References 51 publications

Photonic Crystal Waveguides Composed of Hyperbolic Metamaterials for High-FOM Nano-Sensing

Photonic Crystal Waveguides Composed of Hyperbolic Metamaterials for High-FOM Nano-Sensing

Graphene Oxides as Epsilon‐Near‐Zero Platforms Operating in Terahertz Frequency Range

Forward and backward propagation guided-mode waves of electric dipole resonances in an h-BN metasurface

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