Wideband slow light achievement in MIM plasmonic waveguide by controlling Fano resonance

Zafar, Rukhsar; Salim, Mohammad

doi:10.1016/j.infrared.2014.06.006

Cited by 31 publications

(4 citation statements)

References 27 publications

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“…But, as the position of the lower nano slit is moved towards MIM waveguide (Fig 1(c)), an asymmetry is induced in the structure. Due to this marginal break in symmetry of structure, some special modes are allowed to propagate, which are usually considered to be forbidden in perfect structure [15,29]. These especially excited modes are called Fano modes.…”

Section: Introductionmentioning

confidence: 99%

“…The broad Lorentzian mode is called bright mode, as it is highly radiative in nature, while the narrow Fano resonance is weakly coupled to radiation, so it is called dark mode. It is excited only when there is a break in symmetry [15,29]. An asymmetric Fano resonance is characterized by ultra high value of quality factor and it is very much sensitive to changes in geometrical parameters [15].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Figure of Merit in Fano Resonance-Based Plasmonic Refractive Index Sensor

2015

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Surface plasmon modes possesses an intriguing feature of confining light beyond diffraction limit which makes it very attractive for sensing applications. Here, we theoretically investigated an ultra compact surface Plasmon (SP) sensor using Metal-Insulator-Metal (MIM) waveguide geometry. MIM waveguide is coupled to a pair of stub resonators and both the stub resonators are loaded with a metallic nano slit of silver. The stubs and MIM waveguide are filled with liquid/ gaseous material which is to be sensed. The Fano resonance which is very sensitive to any change in refractive index of the material, is excited in the structure by breaking marginal symmetry. The Structure is numerically simulated by Finite Difference Time Domain (FDTD) method and the result shows that resonance wavelength has a linear relation with refractive index of the material under sensing. In the optimum design of proposed sensor, the maximum sensitivity is obtained as high as S= 1060 nm/RIU with large value of Figure of merit (FOM=176.7) and an ultra narrow linewidth ∆ = . Thus, the device is well suited for designing on-chip optical sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Figure of Merit in Fano Resonance-Based Plasmonic Refractive Index Sensor

2015

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“…This would limit their practical applications. Distinctively different from quasi-lorentzian resonances, Fano resonance generally has an asymmetric and sharp lineshape [ 7 , 8 , 9 ]. More importantly, it is very sensitive to the changes in geometry and local dielectric environment, which can lead to many potential applications in bio/chemical sensors, information modulators, optical filters, ultra-fast switches, and so on [ 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Tunable Nanosensor Based on Fano Resonances Created by Changing the Deviation Angle of the Metal Core in a Plasmonic Cavity

Wang

Ouyang

Sun

et al. 2018

Sensors

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In this paper, a type of tunable plasmonic refractive index nanosensor based on Fano resonance is proposed and investigated. The sensor comprises a metal-insulator-metal (MIM) nanocavity with a center-deviated metal core and two side-coupled waveguides. By carefully adjusting the deviation angle and distance of the metal core in the cavity, Fano resonances can be obtained and modulated. The Fano resonances can be considered as results induced by the symmetry-breaking or geometric effect that affects the field distribution intensity at the coupling region between the right waveguide and the cavity. Such a field-distribution pattern change can be regarded as being caused by the interference between the waveguide modes and the cavity modes. The investigations demonstrate that the spectral positions and modulation depths of Fano resonances are highly sensitive to the deviation parameters. Furthermore, the figure of merit (FOM) value is calculated for different deviation angle. The result shows that this kind of tunable sensor has compact structure, high transmission, sharp Fano lineshape, and high sensitivity to the change in background refractive index. This work provides an effective method for flexibly tuning Fano resonance, which has wide applications in designing on-chip plasmonic nanosensors or other relevant devices, such as information modulators, optical filters, and ultra-fast switches.

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“…The steeper and linear slope leads to uniform and slower group velocity across a bandwidth 13,14 . Slowing the light to the extent of freezing has led to the applications which can revolutionize the future of computing including quantum memories [15][16][17][18] and optical buffers 19 . Another area of applications is based on the sharp amplitude response that is obtained when spectrally nearby resonances are coupled to form the EIT within a narrow band.…”

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confidence: 99%

Wave discrimination at C-band frequencies in microstrip structures inspired by electromagnetically induced transparency

Jabbar

Ramzan

Siddiqui

et al. 2021

Sci Rep

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We present the design and practical implementation of a microstrip diplexer based on the wave discrimination property associated with the electromagnetically induced transparency (EIT)-like effect. The EIT is a quantum interference phenomenon which happens between two atomic transition pathways and allows wave propagation within a medium’s absorption spectrum. Here, we exploit an analogous interference mechanism in a three-port microstrip structure to demonstrate a diplexer based on the EIT-like effect in the microwave regime. Since the transparency is accompanied by a high transmission and strong dispersion characteristics, compact frequency discriminating structures that can resolve nearby frequencies with high isolation can be devised. Our proposed C-band diplexer consists of pairs of unequal open-circuit stubs, which resonate at detuned frequencies and interfere to form the EIT-like passbands for diplexer action. The design is highly compact and scalable in frequency for both PCB and on-chip applications. A prototype of diplexer is fabricated for the center frequencies of lower and upper passbands at 4.6 GHz and 5.5 GHz respectively. The transmission zeros are designed at the complementary channels so that the two passbands are highly isolated presenting the isolation of about 40 dB. The measured insertion loss of lower and upper passband is 0.59 dB and 0.61 dB respectively. Measured input return loss is better than − 15 dB, while the output return losses are well below − 12 dB. Moreover, a decent value of about 200 is achieved for the group refractive index around the EIT-like passbands, which reveals the slow wave characteristics of the proposed EIT-based diplexer.

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Wideband slow light achievement in MIM plasmonic waveguide by controlling Fano resonance

Cited by 31 publications

References 27 publications

Enhanced Figure of Merit in Fano Resonance-Based Plasmonic Refractive Index Sensor

Enhanced Figure of Merit in Fano Resonance-Based Plasmonic Refractive Index Sensor

Tunable Nanosensor Based on Fano Resonances Created by Changing the Deviation Angle of the Metal Core in a Plasmonic Cavity

Wave discrimination at C-band frequencies in microstrip structures inspired by electromagnetically induced transparency

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