Femtosecond laser-ultrasonic investigation of plasmonic fields on the metal/gallium nitride interface

Chen, Hung-Pin; Wen, Yu-Chieh; Chen, Yi Hsin; Tsai, Cheng Hua; Lee, Kuang Li; Wei, Pei‐Kuen; Sheu, Jinn-Kong; Sun, Chi‐Kuang

doi:10.1063/1.3503633

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…For our structure, we estimate the frequency of such waves to be in the range of 5 to 7.5 GHz. Similar modes were observed in previous acousto-optical experiments 20,24 . The second type of modes, shown schematically by the horizontal arrows in Fig.1 (c), has a bulk nature and propagates in GGG after diffraction from the periodic grating structure.…”

supporting

confidence: 89%

“…For instance, the spectrum has a dip at f = 16.1 GHz instead of the expected peak related to the fundamental (n=1) LA near-surface mode. We attribute the spectral lines in the spectral region f < 30 GHz to various surface modes excited in the Au grating as observed also in earlier works 20,24 . The exact spectrum of the modulated signals depends on the dispersion of these modes and their interaction with bulk modes in GGG.…”

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confidence: 79%

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Modulation of a surface plasmon-polariton resonance by subterahertz diffracted coherent phonons

et al. 2012

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Coherent sub-THz phonons incident on a gold grating that is deposited on a dielectric substrate undergo diffraction and thereby induce an alteration of the surface plasmon-polariton resonance. This results in efficient high-frequency modulation (up to 110 GHz) of the structure's reflectivity for visible light in the vicinity of the plasmon-polariton resonance. High modulation efficiency is achieved by designing a periodic nanostructure which provides both plasmon-polariton and phonon resonances. Our theoretical analysis shows that the dynamical alteration of the plasmon-polariton resonance is governed by modulation of the slit widths within the grating at the frequencies of higher-order phonon resonances. PACS numbers: 73.20.Mf, 78.20.hc Creating new devices based on plasmonic nanostructures (PNs) requires development of new physical concepts where the properties of plasmons and their interaction with photons may be controlled externally. Several methods of this "active plasmonics" 1,2 were reported where the energy and propagation of plasmons were controlled by temperature 3 , optical excitation 4,5 , electric 6 and magnetic fields 7-9 . In order to explore the properties of plasmons in nanodevices it is necessary to realize nondestructive control of plasmons on timescales far below 1 ns. In particular, such techniques could be employed in recently developed plasmon lasers (spasers), to enhance their functionality 10,11 . Only then the advantage of plasmonics as compared traditional integrated electronics may be indeed exploited. By now there are a number of works where ultrafast control of plasmons in PNs has been demonstrated using femtosecond optical excitation 12,13 which possess a number of undesirable side effects, like thermal heating or excitation of high-energy electron states. Besides modulation of the PN dielectric function, plasmonic states may be controlled by modulation of the geometrical parameters of the PN, like size of elements or distances between elements. This can be realized by applying uniaxial stress 14,15 and, for dynamical modulation, acoustic waves may be used. The feasibility of such an acoustic approach for the modulation of plasmonic properties has been already shown in a number of recent works, where THz phonons interact with the plasmon resonance in a very small noble metal particle 16,17 , or in periodic structures but in the frequency range up to 10 GHz 18-20 .The aim of the present work is to realize an efficient modulation by sub-THz coherent phonons in a PN which has a narrow band plasmon-polariton resonance in the k 0 E α d G o ld G a d o li n iu m G a ll iu m G a r n e t AFM-Image 750 800 850 900 4°2°6°8°1 0°D etection Glanpolarizer λ/2 t 0 =78 ns BBO Beamsplitter q=2π n/d Strain-Pulse α Regenerative Amplifier 800 nm (a) (b) (c) r h α = Augrating GGG Al x y z T=5 K Reflected intensity R 0 Wavelength (nm) [111] 400nm 0 1 2 3 FIG. 1. (a) The scheme of the sample and AFM image of the grating. (b) The reflectivity spectrum for p-polarized white light from the Au grating on G...

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confidence: 89%

supporting

confidence: 79%

Modulation of a surface plasmon-polariton resonance by subterahertz diffracted coherent phonons

et al. 2012

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“…Surface plasmon polaritons (SPPs) were first observed by Wood [30] in 1902 and have since been identified as collective electron oscillations coupled to an electromagnetic wave propagating along a metal-dielectric interface [31][32][33]. Surface plasmons can be generated in several different ways.…”

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confidence: 99%

Plasmonic enhancement of photoacoustic-induced reflection changes

et al. 2021

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In this paper, we report on surface-plasmon-resonance enhancement of the time-dependent reflection changes caused by laser-induced acoustic waves. We measure an enhancement of the reflection changes induced by several acoustical modes, such as longitudinal, quasi-normal, and surface acoustic waves, by a factor of 10-20. We show that the reflection changes induced by the longitudinal and quasi-normal modes are enhanced in the wings of the surface plasmon polariton resonance. The surface acoustic wave-induced reflection changes are enhanced on the peak of this resonance. We attribute the enhanced reflection changes to the longitudinal wave and the quasi-normal mode to a shift in the surface plasmon polariton resonance via acoustically induced electron density changes and via grating geometry changes.

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“…15 Less attention was paid to the elasto-optical effects that occur in bulk solid media at a distance from the nanostructure larger than the optical wavelength, where light has a well-defined wavevector and a corresponding propagation direction. 16 The spatial and spectral distributions of this far-field region are changed due to the diffraction of light by a periodic nanostructure. Consequently, its interaction with coherent phonons becomes more complex than in case of a plain homogeneous surface, shown in Fig.…”

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confidence: 99%

Studying periodic nanostructures by probing the in-sample optical far-field using coherent phonons

Brüggemann

Jäger

Glavin

et al. 2012

Applied Physics Letters

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Optical femtosecond laser pulses diffracted into a crystalline substrate by a gold grating on top interact with gigahertz coherent phonons propagating towards the grating from the opposite side. As a result, Brillouin oscillations are detected for diffracted light. The experiment and theoretical analysis show that the amplitude of the oscillations for the first order diffracted light exceeds that of the zero order signal by more than ten times. The results provide a method for internal probing of the optical far-field inside materials containing periodic nanostructures.

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Femtosecond laser-ultrasonic investigation of plasmonic fields on the metal/gallium nitride interface

Cited by 12 publications

References 25 publications

Modulation of a surface plasmon-polariton resonance by subterahertz diffracted coherent phonons

Modulation of a surface plasmon-polariton resonance by subterahertz diffracted coherent phonons

Plasmonic enhancement of photoacoustic-induced reflection changes

Studying periodic nanostructures by probing the in-sample optical far-field using coherent phonons

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