Nanogroove array on thin metallic film as planar lens with tunable focusing

Wellems, L. David; Huang, Danhong; Leskova, T. A.; Maradudin, A. A.

doi:10.1016/j.physleta.2011.11.002

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…If we treat the SIBC in Eqs. (13), (14), (15) and (16) as a perturbation for small η L and η R , we can express A s (β), A a (β), B s (β) and B a (β) by the discrete Fourier expansion coefficients a j sn , b j sn , a j an and b j an to the leading order of the perturbation. Alternatively, if only the diagonal contributions for the term proportional to η L or η R are kept 3,11,16 in Eqs.…”

Section: This Leads Tomentioning

confidence: 99%

“…Alternatively, if only the diagonal contributions for the term proportional to η L or η R are kept 3,11,16 in Eqs. (13), (14), (15) and (16) [i.e., including only the terms with β = ±β in the integrals], A s (β), A a (β), B s (β) and B a (β) can also be expressed by the discrete Fourier expansion coefficients a j sn , b j sn , a j an and b j an . However, such a simplification 3,11,16 needs to be justified physically.…”

Section: This Leads Tomentioning

confidence: 99%

“…(21), from Eqs. (13), (14), (15) and (16) we finally obtain four integral equations for A s (β), A a (β), B s (β) and B a (β)…”

Section: Integral Equationsmentioning

confidence: 99%

“…In our previous study 14 , we have shown the longitudinally color-dependent light focusing by a finite linear array of grooves with various widths in a parabolic pattern, where various focal lengths of a slit-array aperture were obtained for an incident plane wave with different colors. Here, rather than using a Green's function formalism 12,15 , we present a scatteringwave theory which utilizes a slit-eigenmode expansion to treat an arbitrary array of slits having arbitrary spacings, widths and dielectrics.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetrically filled slits in a metal film that split a light beam into two depending on its wavelength

Huang

Wellems

2012

Appl. Opt.

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By applying a scattering-wave theory, the electromagnetic response of an arbitrary array of multiple slits perforated on a metallic film and filled with different slit dielectric materials can be studied in an analytical way. Here, the wavelength-dependent splitting of a light beam into two by asymmetrically filled slits in a metal film using intra-and inter-slit dual-wave interferences is fully explored. We consider a triple-slit structure perforated on a gold film, where the middle slit is used for the surface-plasmon excitation by a narrow Gaussian beam while the two side slits are used for the detection of a transmitted surface-plasmon wave propagated from the middle opaque slit either at a particular wavelength or at double that wavelength, respectively. For this proposed simple structure, we show that only one of the two side observation slits can be in a passing state for a particular wavelength, but the other blocked slit will change to a passing state at double that wavelength with a specific design for the slit depth, slit dielectric, and inter-slit distance in the deep sub-wavelength regime. In this sense, surface-plasmon mediated light transmission becomes wavelength sensitive in our model, and a single light beam can be separated into two according to its wavelength in the transverse direction parallel to the array. This provides us with a unique way for direct optical reading in the near-field region using a non-spectroscopic approach.

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Section: This Leads Tomentioning

confidence: 99%

Section: This Leads Tomentioning

confidence: 99%

“…(21), from Eqs. (13), (14), (15) and (16) we finally obtain four integral equations for A s (β), A a (β), B s (β) and B a (β)…”

Section: Integral Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Asymmetrically filled slits in a metal film that split a light beam into two depending on its wavelength

Huang

Wellems

2012

Appl. Opt.

Self Cite

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show abstract

“…In our previous study , 7 we have shown the longitudinally color-dependent light focusing by a finite linear array of grooves with various widths in a parabolic pattern, where various focal lengths of a slit-array aperture were obtained for an incident plane wave with different colors. Here, rather than using a Green's function formalism , 8,9 we present a scattering-wave theory which utilizes slit-eigenmode expansion to treat an arbitrary array of slits having arbitrary spacings, width and dielectrics.…”

Section: Introductionmentioning

confidence: 99%

Surface-plasmon mediated near-field light diffraction

Huang

Wellems

2012

SPIE Proceedings

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The electromagnetic response of an arbitrary array of multiple slits perforated on a metallic film and filled with different slit dielectric materials is studied in an analytical way. As a specific example, we consider a tripleslit structure perforated on a gold film, where the middle slit is used for the surface-plasmon excitation by a narrow Gaussian beam while the other two side slits are used for the detection of a transmitted surface-plasmon wave propagated from the middle opaque slit either at a particular wavelength or at double that wavelength, respectively. For this particular structure, we show that only one of the two side observation slits can be in a passing state for a particular wavelength, but the other blocked slit will change to a passing state at double that wavelength with a specific design for the slit depth, silt dielectric and inter-slit distance in the deep subwavelength regime. In this sense, we create a surface-plasmon mediated light diffraction in the near-filed regime.

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