Design of plasmonic circular grating with broadband absorption enhancements

Chiu, Nan Fu; Yang, Cheng; Kao, Yi Lun; Cheng, Chih Jen

doi:10.1117/12.2182348

Cited by 2 publications

(1 citation statement)

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“…The number and period of grating rings, the material used, and the slit geometry are all controllable, thus demonstrating the flexibility of gratings as plasmonic tools for sensing applications [4]. Plasmonic gratings enhance light absorption, scattering, and optical detection [11][12][13][14][15][16][17]; they have been used in solar cell enhancement devices [18][19][20][21][22], biosensing [23][24][25][26][27], and fluorescence [28][29][30][31] applications. Slits are typically considered to be areas of a large metal slab where the metal has been removed [32,33].…”

Section: Introductionmentioning

confidence: 99%

Improved optical enhancement using double-width plasmonic gratings with nanogaps

Darweesh¹,

Bauman²,

Herzog³

2016

Photon. Res.

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Plasmonic grating structures have been shown effective at increasing near-field optical enhancement. A doublewidth plasmonic grating design is introduced, where each period has two alternating metal widths separated by a nanogap. With this new design, analysis has shown that plasmonic resonances couple between each metal section, resulting in even greater optical enhancement compared with single-width gratings. The geometry that gives the greatest optical enhancement has been determined with a computational model. This work demonstrates that the increased enhancement is due to hybridized modes that couple between the two grating segments.

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