Simulating electric field intensity distribution of LSPR based on gold nanobipyramids

Ke, Qinglin; Chen, Le; Fang, Bowen; Chen, Yun; Zhang, Wentao

doi:10.1016/j.mtcomm.2020.101953

Cited by 7 publications

(6 citation statements)

References 43 publications

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“…Metal nanoparticles are the most popular nanomaterials with fantastic plasmon resonance enhancement due to the local surface plasmon resonance (LSPR) to satisfy the needs of diverse technical applications. − It is reported that the Si THz modulator with self-assembled gold nanospheres exhibits high modulation depth due to the efficient increase of light coupling at the interface inside the visible light band. , The plasmon wavelength of gold nanorods (AuNRs) can be tuned to the infrared region to achieve large modulation in AuNRs-integrated Si modulators. , But the local electric field enhancement is still not high enough due to the rounded or flat ends. Gold nanobipyramids (AuNBPs) with two sharp ends bring much larger local field enhancement, as well as larger optical cross sections, narrower line widths, and higher refractive index sensitivity. − The longitudinal plasmon wavelength of AuNBPs is approximately proportional to the aspect ratio and can be synthetically expanded to wide excitation waveband to fit various scenarios. These inherent properties make AuNBPs a great candidate for spectroscopy, photocatalysis, and biomedical technologies. − On the contrary, it is worth noting that the bare Si modulator is often frequency independent with fixed functionality.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh Modulation Enhancement in All-Optical Si-Based THz Modulators Integrated with Gold Nanobipyramids

et al. 2022

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Optical regulation strategy with the aid of hybrid materials can significantly optimize the performance of terahertz devices. Gold nanobipyramids (AuNBPs) with synthetical tunability to the near-infrared band show strong local field enhancement, which improves optical coupling at the interface and benefits the modulation performance. We design AuNBPs-integrated terahertz modulators with multiple structured surfaces and demonstrate that introducing AuNBPs can effectively enhance their modulation depths. In particular, an ultrahigh modulation enhancement of 1 order of magnitude can be achieved in the AuNBPs hybrid metamaterials accompanied by the multifunctional modulation characteristics. By application of the coupled Lorentz oscillator model, the theoretical calculation suggests that the optical regulation with AuNBPs originates from increased damping rate and higher coupling coefficient under pump excitation. Additionally, a terahertz spatial light modulator is constructed to demonstrate multiple imaging display and consume extremely low power, which is promising for the potential application in spatial and frequency selective imaging.

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Section: Introductionmentioning

confidence: 99%

Ultrahigh Modulation Enhancement in All-Optical Si-Based THz Modulators Integrated with Gold Nanobipyramids

et al. 2022

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“…The light absorption of perovskite materials decreases rapidly in the wavelength range of about 600-800 nm, resulting in a severe shortage of light absorption in some visible and near-infrared bands. By adjusting its aspect ratio, the extinction peak of gold nanobipyramids (NBPs) can cover the near-infrared region [5][6] , effectively solving the problem that perovskite is insensitive to light absorption Long-band. In this paper, the finite-difference time-domain (FDTD) method is used to simulate the gold NBPs perovskite solar cell, calculate the light absorption of the absorption layer, and further study the electric field enhancement of the NBPs.…”

Section: Introductionmentioning

confidence: 99%

Study on light absorption enhancement of perovskite solar cells by gold nanobipyramids

Luo

Chen

Fang

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

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As the third generation of solar cells, perovskite solar cells have attracted extensive attention because of their relatively simple structure and high theoretical photoelectric conversion efficiency. However, there are still some problems in thin film perovskite solar cells, such as severe light energy loss, less light absorption in the near-infrared region and part of visible wavelength. Without increasing the thickness of the perovskite absorption layer, using the plasmon effect of metal nanoparticles is an effective method to reduce the light energy loss and enhance the light absorption of solar cells. In this paper, the light absorption of two kinds of perovskite solar cells with and without gold nanobipyramids array structure are simulated by the finite difference time domain method. The results show that the light absorption efficiency of the absorption layer of perovskite solar cells with gold nanobipyramids array structure is improved by 42.93%. Further research shows that the local surface plasmon resonance of gold nanobipyramids can produce substantial electric field enhancement, which may be why gold nanobipyramids enhance the light absorption and improve the efficiency of perovskite solar cells. This study provides a new idea to improve the photoelectric conversion efficiency of perovskite solar cells.

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“…Although AuNR has an attractive plasma behavior, the local electric field enhancement is still limited due to the round or flat ends, working against surface enhancement spectroscopy. The gold nanobipyramids (AuNBP) with two tips can bring about greater local field enhancement, as well as larger optical cross-sections, narrower linewidth, and higher refractive index sensitivity [13][14][15] . Furthermore, AuNBPs has two dipolar plasma modes, namely the longitudinal and transverse modes.…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh modulation enhancement in all-optical THz modulators integrated with gold nanobipyramids

Zhang

Chen

Zhou

et al. 2022

Infrared, Millimeter-Wave, and Terahertz Technologies IX

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Optical regulation strategy with the aid of hybrid materials can significantly optimize the performance of terahertz devices so as to be used in the real world. Gold nanobipyramids (AuNBPs) with synthetical tunability to the nearinfrared band show strong local electric field enhancement, which improves the optical coupling at the interface and benefits the modulation performance of all-optical devices. Here we design AuNBPs-integrated terahertz modulators with multiple structured surfaces and indicate that introducing AuNBPs can effectively enhance their modulation depths. In particular, an ultrahigh modulation enhancement with one order of magnitude can be achieved in the AuNBPs hybrid metamaterials accompanied with the multifunctional modulation characteristics. Applying the coupled Lorentz oscillator model, the theoretical calculation suggests that the optical regulation with AuNBPs originates from increased damping rate and higher coupling coefficient under pump excitation. With the help of excellent modulation enhancement in the AuNBPs integrated metastructures, a prototype of novel spatial light modulator is constructed. As a novel terahertz photonic device with the low-power consumption and multifunctionality, this modulator is promising for the potential application in spatial and frequency selective imaging.

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Simulating electric field intensity distribution of LSPR based on gold nanobipyramids

Cited by 7 publications

References 43 publications

Ultrahigh Modulation Enhancement in All-Optical Si-Based THz Modulators Integrated with Gold Nanobipyramids

Ultrahigh Modulation Enhancement in All-Optical Si-Based THz Modulators Integrated with Gold Nanobipyramids

Study on light absorption enhancement of perovskite solar cells by gold nanobipyramids

Ultrahigh modulation enhancement in all-optical THz modulators integrated with gold nanobipyramids

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