Design of a C aperture to achieve λ/10 resolution and resonant transmission

Xiaolei Shi; Lambertus Hesselink

doi:10.1364/JOSAB.21.001305

Journal of the Optical Society of America B
Vol. 21,
Issue 7,
pp. 1305-1317
(2004)
•https://doi.org/10.1364/JOSAB.21.001305

Design of a C aperture to achieve λ/10 resolution and resonant transmission

Xiaolei Shi and Lambertus Hesselink

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Xiaolei Shi and Lambertus Hesselink, "Design of a C aperture to achieve λ/10 resolution and resonant transmission," J. Opt. Soc. Am. B 21, 1305-1317 (2004)

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Abstract

Small subwavelength apertures provide high spatial resolution that is not limited by the diffraction limit. However, application of these apertures to practical problems has been hindered by the critical problem of extremely low power transmission efficiency. Recently, we reported a specially designed subwavelength aperture that has a letter C shape (X. Shi, R. L. Thornton, and L. Hesselink, Opt. Lett. 28, 1320 (2003)]. A well-designed C aperture can provide both a high spatial resolution of ∼λ/10 and a high power throughput greater than 1. We present the underlying design ideas of the C aperture and report interesting general properties of optical transmissions through a single two-dimensional subwavelength aperture, based on numerical finite-difference time-domain simulations and fundamental observations. These results are expected to provide helpful information for both C-aperture applications and general studies of subwavelength metallic structures.

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Aperture	Area	$d (nm)$	PT	Peak Intn.	$W_{x} (nm)$	$W_{y} (nm)$
C1	$0.054 λ^{2}$	48	4.41	36	128	136
C2	$0.038 λ^{2}$	48	4.87	88	128	100
C3	$0.025 λ^{2}$	48	6.29	120	128	92
C2	$0.038 λ^{2}$	24	4.87	356	80	75
C3	$0.025 λ^{2}$	24	6.29	550	92	72
Square	$0.01 λ^{2}$	48	0.0078	0.019	140	80

Ag Thickness (nm)	PT	Peak Intensity	$W_{x} (nm)$	$W_{y} (nm)$
120	$2.45 \times 10^{- 3}$	$2.67 \times 10^{- 3}$	160	110
180	$1.75 \times 10^{- 4}$	$2.10 \times 10^{- 4}$	160	110
240	$1.20 \times 10^{- 5}$	$1.70 \times 10^{- 5}$	160	110

Aperture	Metal	Thickness	PT	$W_{x} (nm)$	$W_{y} (nm)$	Peak Intn.
100-nm square	PEC	1 grid (4 nm)	0.0078	140	80	0.019
Original C1	PEC	1 grid (4 nm)	4.41	128	136	36
100-nm square	Ag	120 nm	0.0025	160	110	0.0027
Original C1	Ag	120 nm	0.20	140	170	2.02
Modified C1	Ag	120 nm	2.20	115	130	7.42

Aperture	Area	$d (nm)$	PT	Peak Intn.	$W_{x} (nm)$	$W_{y} (nm)$
C1	$0.054 λ^{2}$	48	4.41	36	128	136
C2	$0.038 λ^{2}$	48	4.87	88	128	100
C3	$0.025 λ^{2}$	48	6.29	120	128	92
C2	$0.038 λ^{2}$	24	4.87	356	80	75
C3	$0.025 λ^{2}$	24	6.29	550	92	72
Square	$0.01 λ^{2}$	48	0.0078	0.019	140	80

Ag Thickness (nm)	PT	Peak Intensity	$W_{x} (nm)$	$W_{y} (nm)$
120	$2.45 \times 10^{- 3}$	$2.67 \times 10^{- 3}$	160	110
180	$1.75 \times 10^{- 4}$	$2.10 \times 10^{- 4}$	160	110
240	$1.20 \times 10^{- 5}$	$1.70 \times 10^{- 5}$	160	110

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Journal of the Optical Society of America B