Modulation of plasmonic relaxation damping by surface phonons

Barman, Kuntal; Ma, Syu-Cin; Huang, JianJang

doi:10.1364/prj.455665

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…We previously demonstrated a method to enhance the plasmonic response of gold nanoparticles utilizing plasmon–phonon interactions [ 33 ]. With surface acoustic wave (SAW) modulation, we induce a sustained drag effect on the plasmons, resulting in a redistribution of the electron cloud on the nanoparticle surface.…”

Section: Introductionmentioning

confidence: 99%

Surface acoustic wave actuated plasmonic signal amplification in a plasmonic waveguide

Gupta,

Barman,

Lee

et al. 2024

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Enhancement of nanoscale confinement in the subwavelength waveguide is a concern for advancing future photonic interconnects. Rigorous innovation of plasmonic waveguide-based structure is crucial in designing a reliable on-chip optical waveguide beyond the diffraction limit. Despite several structural modifications and architectural improvements, the plasmonic waveguide technology is far from reaching its maximum potential for mass-scale applications due to persistence issues such as insufficient confined energy and short propagation length. This work proposes a new method to amplify the propagating plasmons through an external on-chip surface acoustic signal. The gold–silicon dioxide (Au-SiO2) interface, over Lithium Niobate (LN) substrate, is used to excite propagating surface plasmons. The voltage-varying surface acoustic wave (SAW) can tune the plasmonic confinement to a desired signal energy level, enhancing and modulating the plasmonic intensity. From our experimental results, we can increase the plasmonic intensity gain of 1.08 dB by providing an external excitation in the form of SAW at a peak-to-peak potential swing of 3 V, utilizing a single chip.

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Section: Introductionmentioning

confidence: 99%

Surface acoustic wave actuated plasmonic signal amplification in a plasmonic waveguide

Gupta,

Barman,

Lee

et al. 2024

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Enhanced quantum efficiency and Purcell factor of incoherent light-emitting source modulators coupled with nanoantennas: DDA modeling and optimization

Mota¹,

Mosallaei²

2022

J. Opt. Soc. Am. B

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Gated tunable materials-based devices have proven efficient structures to dynamically control quantum emitters’ (QEs) photonic density of states. The active permittivity control enabled by these materials allows manipulating the coupling and dissipation of evanescent modes radiated by the QE, hence controlling the emission parameters. In this sense, we propose here the design and optimization of a plasmonic device coupled with nanoantennas capable of dynamically manipulating the QEs’ emission at visible wavelengths using a thin gated doped titanium nitrate layer. We explore the use of metallic cubic and bow-tie antennas and study their unique characteristics related to enhancing the QEs’ emission. For the nanoantenna geometrical parameters optimization, we propose a discrete-dipole-approximation (DDA) method to accurately calculate all the radiation parameters of a QE embedded in a layered medium coupled to a nanoantenna. This technique allows calculating the decay behavior of QEs arbitrarily distributed, which is only feasible with knowledge of the Purcell factor and quantum efficiency mapped for all possible positions, easily achieved with the proposed model. We show that by employing the proposed DDA, the time required for optimizing and building those maps to evaluate the device’s response is drastically reduced (98%) compared to conventional numerical techniques. Using the DDA to optimize the antenna allowed the device’s quantum efficiency to be enhanced from 1.8% (no nanoantenna) to 8% and 10.5% using the cubic and bow-tie nanoantenna, respectively. In addition, the nanoantenna helps decrease the QE lifetime by a factor of approximately 2, allowing faster modulation speeds. Finally, our modeling and findings can be used to pave the way for the design of new gated optical modulators coupled with nanoantennas for applications that require amplitude modulation.

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Optical colorimetric LiTaO₃ wafers for high-precision lithography on frequency control of SAW devices

Fang,

Xie,

Xue

et al. 2024

Photon. Res.

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Surface acoustic wave (SAW) resonators based on lithium tantalate (LT, LiTaO3) wafers are crucial elements of mobile communication filters. The use of intrinsic LT wafers typically brings about low fabrication accuracy of SAW resonators due to strong UV reflection in the lithography process. This hinders their resonance frequency control seriously in industrial manufacture. LT doping and chemical reduction could be applied to decrease the UV reflection of LT wafers for high lithographic precision. However, conventional methods fail to provide a fast and nondestructive approach to identify the UV performance of standard single-side polished LT wafers for high-precision frequency control. Here, we propose a convenient on-line sensing scheme based on the colorimetry of reduced Fe-doped LT wafers and build up an automatic testing system for industrial applications. The levels of Fe doping and chemical reduction are evaluated by the lightness and color difference of LT-based wafers. The correlation between the wafer visible colorimetry and UV reflection is established to refine the lithography process and specifically manipulate the frequency performance of SAW resonators. Our study provides a powerful tool for the fabrication control of SAW resonators and will inspire more applications on sophisticated devices of mobile communication.

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Modulation of plasmonic relaxation damping by surface phonons

Cited by 3 publications

References 54 publications

Surface acoustic wave actuated plasmonic signal amplification in a plasmonic waveguide

Surface acoustic wave actuated plasmonic signal amplification in a plasmonic waveguide

Enhanced quantum efficiency and Purcell factor of incoherent light-emitting source modulators coupled with nanoantennas: DDA modeling and optimization

Optical colorimetric LiTaO₃ wafers for high-precision lithography on frequency control of SAW devices

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Modulation of plasmonic relaxation damping by surface phonons

Cited by 3 publications

References 54 publications

Surface acoustic wave actuated plasmonic signal amplification in a plasmonic waveguide

Surface acoustic wave actuated plasmonic signal amplification in a plasmonic waveguide

Enhanced quantum efficiency and Purcell factor of incoherent light-emitting source modulators coupled with nanoantennas: DDA modeling and optimization

Optical colorimetric LiTaO3 wafers for high-precision lithography on frequency control of SAW devices

Contact Info

Product

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Optical colorimetric LiTaO₃ wafers for high-precision lithography on frequency control of SAW devices