Broadband surface plasmon wave excitation using dispersion engineering

Chasnitsky, Michael; Golosovsky, M.; Davidov, D.

doi:10.1364/oe.23.030570

“…It has been already shown that effective dispersion engineering in the composite structures can be achieved by patterning the metal layer 36 – 38 . To learn more about the dispersion characteristics for both the configurations, we have calculated the reflectivity of both configurations as a function of wavelength and incident angle.…”

Section: Resultsmentioning

confidence: 99%

Dispersion engineering with plasmonic nano structures for enhanced surface plasmon resonance sensing

Arora

¹

,

Talker

²

,

Mazurski

³

et al. 2018

Sci Rep

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We demonstrate numerically and experimentally the enhancement of Surface Plasmon Resonance (SPR) sensing via dispersion engineering of the plasmonic response using plasmonic nanograting. Following their design and optimization, the plasmonic nanograting structures are fabricated using e-beam lithography and lift-off process and integrated into conventional prism based Kretschmann configuration. The presence of absorptive nanograting near the metal film, provides strong field enhancement with localization and allows to control the dispersion relation which was originally dictated by a conventional SPR structure. This contributes to the enhancement in Q factor which is found to be 3–4 times higher as compared to the conventional Kretschmann configuration. The influence of the incident angle on resonance wavelength is also demonstrated both numerically and experimentally, where, only a negligible wavelength shift is observed with increasing the incident angles for plasmonic nanograting configuration. This surprising feature may be helpful for studying and utilizing light-matter interaction between plasmons and narrow linewidth media (e.g. Rb atom or molecule) having nonlocalities in their susceptibility-momentum relation. Finally, we analyze the role of plasmonic nanograting in enhancing the performance of an SPR sensor. Our results indicate that the integrated SPR-nanograting device shows a great promise as a sensor for various types of analytes.

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“…It has been already shown that effective dispersion engineering in the composite structures can be achieved by patterning the metal layer [36][37][38] . To learn more about the dispersion characteristics for both the configurations, we have calculated the reflectivity of both configurations as a function of wavelength and incident angle.…”

Section: Resultsmentioning

confidence: 99%

Dispersion engineering with plasmonic nanostructures for enhanced surface plasmon resonance sensing

Arora

¹

,

Talker

²

,

Mazurski

³

et al. 2018

Conference on Lasers and Electro-Optics

1

0

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We demonstrate numerically and experimentally the enhancement of Surface Plasmon Resonance (SPR) sensing via dispersion engineering of the plasmonic response using plasmonic nanograting. Following their design and optimization, the plasmonic nanograting structures are fabricated using e-beam lithography and lift-off process and integrated into conventional prism based Kretschmann configuration. The presence of absorptive nanograting near the metal film, provides strong field enhancement with localization and allows to control the dispersion relation which was originally dictated by a conventional SPR structure. This contributes to the enhancement in Q factor which is found to be 3-4 times higher as compared to the conventional Kretschmann configuration. The influence of the incident angle on resonance wavelength is also demonstrated both numerically and experimentally, where, only a negligible wavelength shift is observed with increasing the incident angles for plasmonic nanograting configuration. This surprising feature may be helpful for studying and utilizing light-matter interaction between plasmons and narrow linewidth media (e.g. Rb atom or molecule) having nonlocalities in their susceptibility-momentum relation. Finally, we analyze the role of plasmonic nanograting in enhancing the performance of an SPR sensor. Our results indicate that the integrated SPR-nanograting device shows a great promise as a sensor for various types of analytes.Surface Plasmon Polariton (SPP) is an electromagnetic wave propagating along a metal-dielectric interface, coupled to oscillations of electrons in the metal. The coupling of light into SPPs requires phase matching, where the phase velocity of the surface plasmon wave and of the lateral component of the incident light become equal 1,2 . Being localized at the interface, the SPP wave is extremely sensitive to minute changes in refractive index of the dielectric medium, in the vicinity of the interface 3,4 . One of the most common techniques to excite the SPP for sensing is the Kretschmann configuration 5,6 , where the signature of SPP excitation results in a decrease in the intensity of the reflected light from the metal surface for a particular resonance angle or wavelength [7][8][9] . Commonly, to achieve high sensitivity, the resonance linewidth should be as narrow as possible. Unfortunately, plasmonic resonances are typically broad, mostly due to Ohmic loss in the metal 10 . In this regard, coating the Kretschmann configuration prism by thin multilayers was recently reported theoretically and shown experimentally to allow the engineering of the dispersion curve 11,12 . Periodic structures have been shown to provide better figure of merit for sensing via dispersion engineering and in particular via the increase in group index, leading to the narrowing of the resonance linewidth 13,14 . Indeed, enhanced sensitivity detection based on dispersion engineering using metallic gratings applied upon thin metal coated prism has been reported theoretically [15][16][17][18] , but to ...

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“…However, with a special design for photovoltaic applications a high absorption and low reflection were realized [35]. Methods to compensate for the dispersion of SPs and to enable the resonance excitation in a broad spectral range have also been developed [36].…”

Section: Introductionmentioning

confidence: 99%

Surface plasmon sensing with broadband coherent laser pulses

Kolomenskii¹,

Surovic²,

Schuessler³

2019

Optik

1

0

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A broadband detection method with coherent laser pulses exciting surface plasmons is investigated. The intensity and phase characteristics of the reflected light in Kretschmann configuration are calculated. It is shown that by mixing in-plane and out-of-plain polarization components of the incident light, the measurements of the changes of the refractive index of the adjacent media can be efficiently performed by observing the shift of the steep slope of the surface plasmon resonance (SPR) reflectance curve. We have demonstrated that such sensing can be performed by observing the angular shift of the SPR curve as well as the spectral shift. The developed model can account for an arbitrary number of layers and is used to simulate the response when an additional functionalizing layer adjacent to the gold film is used. OCIS codes: (240.6680) Surface plasmons; (320.2250) Femtosecond phenomena; (280.4788) Optical sensing and sensors.

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Broadband surface plasmon wave excitation using dispersion engineering

Cited by 5 publications

References 41 publications

Dispersion engineering with plasmonic nano structures for enhanced surface plasmon resonance sensing

Dispersion engineering with plasmonic nano structures for enhanced surface plasmon resonance sensing

Dispersion engineering with plasmonic nanostructures for enhanced surface plasmon resonance sensing

Surface plasmon sensing with broadband coherent laser pulses

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