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plasmonic structure Kwang Hee Lee 2010 5 19 Photonic Systems Laboratory Contents Introduction of surface plasmon polariton SPP Extraordinary transmissionEOT Effect factors of transmission ID: 590579

surface transmission optical hole transmission surface hole optical spp eot subwavelength lett lezec ebbesen phys effect single patterning exit plasmon factors extraordinary

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Slide1

Beam manipulation via plasmonic structure

Kwang

Hee

, Lee

2010. 5. 19

Photonic Systems LaboratorySlide2

ContentsIntroduction of surface plasmon

polariton

(SPP)

Extraordinary transmission(EOT)

Effect factors of transmission

Exit patterning

SummarySlide3

What is the SPP?for

Evanescent modes

+ +

x

Metal

Dielectric

+ +

+ +

- -

- -

+ +

zSlide4

SPP at a single interfaceSlide5

Where can SPP be used?Integrated electro-photonics,

will

remove the crosstalk and

Ohmic

loss of Electronics

meanwhile retaining the

nano

-features of ElectronicsSlide6

EOTExtraordinary Transmission (EOT)

Sub-wavelength hole arrays : peak at above a

0

contribution of surface modes

Due to grating coupling at regular, periodic lattice

Phase matching condition

Ebbesen

, T. W.,

Lezec

, H. J,

Ghaemi

, H. F., Thio, T., and Wolff, P. A. “Extraordinary optical transmission through sub-wavelength hole arrays.” Nature, 931:667–669. 1998.Slide7

EOTExtraordinary Transmission (EOT)

EOT occurs at another structures : Bull’s eye, square dimple array, slit array

Thio

,

Tineke

,

Pellerin

, K. M.,

Linke

, R. A.,

Lezec

, H. J., and

Ebbesen, T. W. “Enhanced light transmission through a single subwavelength aperture.” Opt. Lett., 26(24):1972–1974. 2001.Porto, J. A., Garcia-Vidal, F. J., and Pendry, J. B. “Transmission resonances on metallic gratings with very narrow slits.” Phys. Rev. Lett., 83(14):2845–2848. 1999.Slide8

Effect factors of transmissionFactor for Surface Plasmon Polaritons (SPP)Flim thickness : T saturation for small thickness (order of skin depth)

Hole width : T increases and the peaks broaden for increasing hole width

Degiron

, A.,

Lezec

, H. J.,

Barnes,W

. L., and

Ebbesen

, T.W. “Effects of hole depth on enhanced light transmission through

subwavelength

hole arrays.”

Appl. Phys. Lett., 81(23):4327–4329. 2002.van der Molen, K. L., Segerink, F. B., van Hulst, N. F., and Kuipers, L. “Influence of hole size on the extraordinary transmission through subwavelength hole arrays.” Appl. Phys. Lett., 85(19):4316–4318. 2004.Slide9

Effect factors of transmissionFactor for Surface Plasmon Polaritons (SPP)Coupled cavity modes in the grooves

h : about frequency

d : about in-phase re-emmision

Exit side grooves don’t influence T

García

-Vidal, F. J.,

Lezec

, H. J.,

Ebbesen

, T. W., and

Martín

-Moreno, L. “Multiple paths to enhance optical transmission through a single

subwavelength slit.” Phys. Rev. Lett., 90(21):213901. 2003.Slide10

Effect factors of transmissionLocalized Surface Plasmons (LSP)

In contrast to PEC case, the maximum in the transmission of real metal near 580 nm can be associated with the excitation of a localized surface plasmon.

the nanohole excitation decays not only into scattered light, but into surface plasmon polaritons.

Chang et al.,“Surface plasmon generation and light transmission by isolated nanoholes and arrays of nanoholes in thin metal films”,

Opt. Express,

Vol.13, No.8, 3150, 2005.Slide11

Effect factors of transmissionLocalized Surface Plasmons (LSP)

Charges accumulate at the edges with a length scale of one wavelength. This increasing charge density enhances the electric field.

The electric field is proportional to the charging time or equivalently 1/f.

Seo et al.,“Terahertz field enhancement by a metallic nano slit operating beyond the skin-depth limit”,

Nature Photonics,

Vol.3,No.3,152-156, 2009.Slide12

Effect factors of transmissionWaveguide resonance

F.J.Garcia-Vidal et al., “Transmission of Light through a Single Rectangular Hole” ,

PRL, 95,

103901, 2005.

Normalized-to-area transmittance at resonance is

proportional to the aspect ratio

, and to the

dielectric constant inside the hole

.

A transmission peak develops at approximately

λ

c

=2ay, with increasing maximum transmittance and decreasing linewidth as ay/ax increases.Slide13

Exit surface patterningExit surface patterning enables directional emission

Lezec

, H. J.,

Degiron

, A.,

Devaux

, E.,

Linke

, R. A., Martin-Moreno, L., Garcia-Vidal, F. J, and

Ebbesen

, T. W. “Beaming light from a

subwavelength

aperture.” Science, 297:820– 822. 2002.Slide14

Exit surface patterningNarrow beam profile is obtained with about 10 grooves

Martín

-Moreno, L., Garcia-Vidal, F. J.,

Lezec

, H. J.,

Degiron

, A., and

Ebbesen

, T. W. “Theory of highly directional emission from a single

subwavelength

aperture surrounded by

surface corrugations.

” Phys. Rev. Lett., 90(16):167401. 2003.Slide15

Off-axis beaming with asymmetric surface gratingsExit surface patterning

Seyoon

Kim,

Hwi

Kim,

Yongjun

Lim, and

Byoungho

Lee

, “Off-axis directional beaming of optical field diffracted by a single

subwavelength

metal slit with asymmetric dielectric surface gratings” Applied Physics Letters 90, 051113, 2007Slide16

Near-field optical probe(conical geometry)Micro-fluidic detector

Applications

Drezet et al., “Extension of Bethe’s diffraction model to conical geometry” ,

Europhys. Lett.,

54(6), pp. 736-740, 2001.

Bravo-Abad et al., “Transmission properties of a single metallic slit” ,

Physical Review E,

69, 026601, 2004.

ε

=1.8978

ε

=2.2506Slide17

Optical switching using nonlinear materialApplications

Porto et al., “Optical bistability in subwavelength slit apertures containing nonlinear media”,

Phys. Rev. B

, 70, 081402, 2004.

The transmission spectra differ for increasing and decreasing fluxes.

d=0.75, a=0.05, h=0.45 um

Optical bistabilitySlide18

SummarySPP has a great possibility to integrate electronics and photonicsExtraordinary

transmission is generated from SPP which is influenced by geometrical parameters.

Transmission is also influenced by

LSP

and waveguide

resonance.

With exit surface patterning, directional

emmision

and off-axis beaming can be possible.

EOT is applicable to various optical devices such as switch, probe and so on.