Ultracompact plasmonic loop–stub notch filter and sensor

Bahramipanah, Mohsen; Abrishamian, Mohammad Sadegh; Mirtaheri, Seyed Abdullah; Liu, Jiaming

doi:10.1016/j.snb.2013.12.084

Cited by 50 publications

(29 citation statements)

References 46 publications

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“…32 However, localized surface plasmon resonance (LSPR) sensors are characteristically insensitive to changes happening outside the active region of the structure and their spatial sensing depth is accordingly constrained to a few nanometers around the nanostructure. [33][34][35] Furthermore, the overall figure-of-merit (FoM), which is defined as the refractive index sensitivity divided by plasmon resonance linewidth, 31 of the LSPR-based sensors harshly suffers from the large plasmon resonance linewidth associated with the large intrinsic absorption of metals at optical wavelengths. 36 In order to increase the FoM, significant research efforts have been devoted to boosting the sensitivity of metallic nanostructures by optimizing their shape.…”

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confidence: 99%

Cavity-Coupled Plasmonic Device with Enhanced Sensitivity and Figure-of-Merit

et al. 2015

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Using full-wafer processing, we demonstrate a sophisticated nanotechnology for the realization of an ultrahigh sensitive cavity-coupled plasmonic device that combines the advantages of Fabry-Perot microcavities with those of metallic nanostructures. Coupling the plasmonic nanostructures to a Fabry-Perot microcavity creates compound modes, which have the characteristics of both Fabry-Perot and localized surface plasmon resonance (LSPR) modes, boosting the sensitivity and figure-of-merit of the structure. The significant trait of the proposed device is that the sample to be measured is located in the substrate region and is probed by the compound modes. It is demonstrated that the sensitivity of the compound modes is much higher than that of LSPR of plasmonic nanostructures or the pure Fabry-Perot modes of the optical microcavity. The response of the device is also investigated numerically and the agreement between measurements and calculations is excellent. The key features of the device introduced in this work are applicable for the realization of ultrahigh sensitive plasmonic devices for biosensing, optoelectronics, and related technologies.

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Cavity-Coupled Plasmonic Device with Enhanced Sensitivity and Figure-of-Merit

et al. 2015

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“…Figure 1 summarizes the various investigations performed to study the THz field enhancement with different gap sizes. Such investigations have lead to the development of the terahertz technology, which are now exploited in electronics, [41][42][43][44][45][46] photonics, [47][48][49] medical sciences, [50][51][52] military, [53][54][55] security 56,57 and conservation of cultural heritages. 58,59 These studies also lead to the improvisation of terahertz devices.…”

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confidence: 99%

Nanoantenna enhanced terahertz interaction of biomolecules

Adak

Tripathi

2019

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Terahertz time-domain spectroscopy (THz-TDS) is a non-invasive, non-contact and label-free technique for biological and chemical sensing as THz-spectra is less energetic and lies in the characteristic vibration frequency regime of proteins and DNA molecules. However, THz-TDS is less sensitive for detection of micro-organisms of size equal to or less than λ/100 (where, λ is wavelength of incident THz wave) and, molecules in extremely low concentrated solutions (like, a few femtomolar). After successful high-throughput fabrication of nanostructures, nanoantennas and metamaterials were found to be indispensable in enhancing the sensitivity of conventional THz-TDS. These nanostructures lead to strong THz field enhancement which when in resonance with absorption spectrum of absorptive molecules, causing significant changes in the magnitude of the transmission spectrum, therefore, enhancing the sensitivity and allowing detection of molecules and biomaterials in extremely low concentrated solutions. Hereby, we review the recent developments in ultra-sensitive and selective nanogap biosensors. We have also provided an in-depth review of various high-throughput nanofabrication techniques. We also discussed the physics behind the field enhancements in sub-skin depth as well as sub-nanometer sized nanogaps. We introduce finite-difference time-domain (FDTD) and molecular dynamics (MD) simulations tools to study THz biomolecular interactions. Finally, we provide a comprehensive account of nanoantenna enhanced sensing of viruses (like, H1N1) and biomolecules such as artificial sweeteners which are addictive and carcinogenic. CONTENTS

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“…Due to not only supporting modes with deep sub-wavelength scales and high group velocity over a very wide range of frequencies but also offering very high optical confinement and acceptable propagation length [5], metal-insulator-metal (MIM) structures, such as optical filters [6,7,8,9], optical switches [10], demultiplexers [11,12], and sensors [13,14,15,16], are widely used. Plasmonic filters based on MIM waveguide structures, such as asymmetric nanodisk filter and sensor [17,18,19], side-coupled cavity sensor [20], notch resonator filter and sensor [21], and circular ring filter and sensor [22,23], are one of the most important optical devices, have attracted tremendous attention, and have been investigated widely in recent years. All of the above-mentioned devices are promising candidates for highly integrated optical circuits.…”

Section: Introductionmentioning

confidence: 99%

Tunable Plasmonic Band-Pass Filter with Dual Side-Coupled Circular Ring Resonators

Liu

Wang

Feng

et al. 2017

Sensors

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A wavelength band-pass filter with asymmetric dual circular ring resonators in a metal-insulator-metal (MIM) structure is proposed and numerically simulated. For the interaction of the local discrete state and the continuous spectrum caused by the side-coupled resonators and the baffle, respectively, the transmission spectrum exhibits a sharp and asymmetric profile. By adjusting the radius and material imbedded in one ring cavity, the off-to-on plasmon-induced absorption (PIA) optical response can be tunable achieved. In addition, the structure can be easily extended to other similar compact structures to realize the filtering task. Our structures have important potential applications for filters and sensors at visible and near-infrared regions.

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Ultracompact plasmonic loop–stub notch filter and sensor

Cited by 50 publications

References 46 publications

Cavity-Coupled Plasmonic Device with Enhanced Sensitivity and Figure-of-Merit

Cavity-Coupled Plasmonic Device with Enhanced Sensitivity and Figure-of-Merit

Nanoantenna enhanced terahertz interaction of biomolecules

Tunable Plasmonic Band-Pass Filter with Dual Side-Coupled Circular Ring Resonators

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