A Compact Optical Switch via Plasmonics of Subwavelength Circular‐Sharp Hole Arrays in Metal Films

Sun, Taiming; Deng, Zhixiang; Sheng, Jiabing; Chen, Zhiyong; Zhu, Weihua; Guo, Wei; Wang, Xinlin

doi:10.1002/andp.201700299

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…Also, an Ag-air grating with the period of w g + g = 130 nm is used on top of the structure to help the SPs excitation, when the incident lightwave impinges on the structure. The dielectric layer is quartz with the permittivity of ε r = 2.25 and the silver is modeled according to the Johnson and Christy data 37,38 . The absorption coefficient (A) can be given by 39 :…”

Section: Design and Simulation Results Of Four-band Perfect Absorber mentioning

confidence: 99%

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Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Nejat

Nozhat

2020

Sci Rep

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In this paper, a multi-band metal-insulator-metal (MIM) perfect absorber with refractive index sensing capability has been investigated in near-infrared region. The proposed structure has been studied for biomedical applications such as detection of solution of glucose in water, diagnosis of different stages of malaria infection, bacillus bacteria and cancer cells. The MIM configuration improves the sensing parameters of the biosensor due to the good interaction with the analyte. The high sensitivity and figure of merit of 2000 nm/RIU and 100 RIU−1 have been achieved, respectively. Also, the Ag-air grating in the suggested plasmonic sensor helps the localized surface plasmons excitation and makes the structure sensitive to the incident lightwave polarization. Therefore, the presented biosensor behaves like a polarization switch with the high extinction ratio and fast response time of 25.15 dB and 100 fs, respectively. The methods of equivalent circuit model and transmission matrix have been utilized to verify the simulation results, as a new challenge in near-infrared region. The new idea of multi-application plasmonic devices, the feasibility of fabrication for the presented structure and utilizing mentioned analytical methods in near-infrared region could pave the way for the future of plasmonic structures.

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Section: Design and Simulation Results Of Four-band Perfect Absorber mentioning

confidence: 99%

“…The process of changing the incident lightwave polarization does not be considered in calculation of the response time. Another main parameter of a plasmonic switch is extinction ratio that exhibits the difference between the absorption values in "ON" and "OFF" states 37 :…”

Section: The Switching Capability Of the Proposed Biosensormentioning

confidence: 99%

Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Nejat

Nozhat

2020

Sci Rep

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“…The most common way to achieve switching capability is changing the refractive index of material, which can be achieved by using adjustable PCMs such as GST, VO 2 and other tunable materials such as graphene and liquid crystals. Changing the polarisation of incident light is another way to achieve switching mechanism [5]. The most important factors of a switch are extinction ratio, response time and optical bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic wideband GST‐based switch in the near‐infrared region

Heidari

Nozhat

2022

IET Optoelectronics

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In this paper, we present a GST‐based wideband plasmonic switch. With the excitation of localised surface plasmons and concentration of electric field in the structure, a near‐perfect and wideband absorption is achieved. The switch consists of a GST layer, which acts as a Fabry–Perot cavity. Increasing the temperature and changing the state of GST lead to a high difference between the absorption spectra in amorphous and crystalline states in a wide range of wavelength. Therefore, the switch has a high extinction ratio of 13.71 dB at the wavelength of 1343 nm. Also, the response time of the switch is obtained as 46 fs. The structure has near‐perfect absorption up to the incident angle of about 20°. Moreover, due to the symmetry of structure, the absorption spectrum is independent of polarisation. To show the validity of simulation results, the analytical method of equivalent circuit model is presented. The proposed polarisation‐insensitive switch with high extinction ratio, fast response time and wide bandwidth can be used in photodetectors, plasmonic modulators and logic gates.

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“…Through the construction of bullseye [6] and hoof-shaped [7] structures, the subwavelength metal structure has high transmittance and application prospect in enhancing optical transmission effect. Besides, these characteristics of the SPs have major applications [8][9][10] in ultra-high resolution imaging [11][12][13], inverse design [14], complementary metal oxide semiconducto (CMOS) digital integrated circuit [15][16][17], light emitting diode [18], steganography [19], and many other fields. Among of them, plasmonic optical Appl.…”

Section: Introductionmentioning

confidence: 99%

“…Sci. 2020, 10, 5246 2 of 10 switch (POS) plays a vital role in the construction of nanophotoniccircuits [7,10]. In particular, as a basic logic element in photoelectric data processing, the advantages of small size and fast response of the POS can make it play an important role.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of a Polarization Selective Visual Optical Switch

et al. 2020

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The subwavelength structure based on metamaterial has been widely used in the application of structure color due to its unique characteristics. Here, a composite structure consisting of a circular hole and different number of metal strips is proposed. By changing the polarization direction of the incident light, the resonance peak in the visible light range shifts, and the material presents different colors. At the same time, take advantage of the shift of the resonance peak, a plasmonic optical switch, of which on/off states can be indicated by the structural color, is constructed, and the maximum contrast ratio is more than 20 dB. In addition, by means of changing the geometric parameters and materials of the metal strip, the colors presented basically cover the whole visible light range. This method theoretically proves the feasibility of using subwavelength structure to construct visual plasmonic optical switch using structural color in the visible light range, which provides a broad prospect for the application of multiple physical mechanism in nanostructure design.

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A Compact Optical Switch via Plasmonics of Subwavelength Circular‐Sharp Hole Arrays in Metal Films

Cited by 8 publications

References 21 publications

Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Multi-band MIM refractive index biosensor based on Ag-air grating with equivalent circuit and T-matrix methods in near-infrared region

Plasmonic wideband GST‐based switch in the near‐infrared region

Numerical Study of a Polarization Selective Visual Optical Switch

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