Investigating the characteristics of TM-pass/TE-stop polarizer designed using plasmonic nanostructures

Amr M. Mahros; Marwa M. Tharwat; Islam Ashry

doi:10.1364/AO.54.004464

Applied Optics
Vol. 54,
Issue 14,
pp. 4464-4470
(2015)
•https://doi.org/10.1364/AO.54.004464

Investigating the characteristics of TM-pass/TE-stop polarizer designed using plasmonic nanostructures

Amr M. Mahros, Marwa M. Tharwat, and Islam Ashry

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Amr M. Mahros, Marwa M. Tharwat, and Islam Ashry, "Investigating the characteristics of TM-pass/TE-stop polarizer designed using plasmonic nanostructures," Appl. Opt. 54, 4464-4470 (2015)

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Abstract

Plasmonics-based polarizers are important for many photonic devices and applications. In this paper, we design and investigate the characteristics of a new TM-pass/TE-stop polarizer using silver nanograting of exponentially tapered slit sidewalls. Performance of the designed polarizer is determined through monitoring the modification of its insertion loss, return loss, extinction ratio, and far-field transform due to changing its structural parameters. We find that the structural parameters of the reported polarizer such as a slit sidewall tapering coefficient and slit opening widths have a significant impact on tuning the polarizer characteristics.

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	$m = 0$	$m = 1$	$m = 2$	$m = 3$	$m = 4$	$m = 5$
$f_{m}$	0.8450	0.0650	0.1240	0.0110	0.8400	5.6460
$ω_{m}$ (rad/s)	0.0000	$0.12 \times 10^{16}$	$0.68 \times 10^{16}$	$0.12 \times 10^{17}$	$0.14 \times 10^{17}$	$0.31 \times 10^{17}$
$Γ_{m}$ (rad/s)	$0.73 \times 10^{14}$	$0.59 \times 10^{16}$	$0.69 \times 10^{15}$	$0.99 \times 10^{14}$	$0.14 \times 10^{16}$	$0.37 \times 10^{16}$

			Return Loss (dB)		Extinction Ratio (dB)
( $α$ )	Insertion Loss (dB)	Bandwidth (nm)	Min	Max	Min	Max
−9	−0.78	183 nm (568–751)	−10.16	−3.39	39.6	51.2
−9	−0.74	471 nm (1029–1500)	−12.61	−2.53	60.1	65.9
−6	−0.55	186 nm (565–751)	−8.96	−3.71	34.5	47.5
−6	−1.14	510 nm (0990–1500)	−8.31	−2.32	54.4	61.1
−3	−0.41	196 nm (556–751)	−9.66	−4.04	22.2	37.5
	−2.42	554 nm (0945–1500)	−4.35	−1.91	42.4	51.5
0	−0.60	188 nm (563–751)	−8.17	−3.91	6.50	21.4
0	−3.60	533 nm (0967–1500)	−2.78	−1.29	27.6	38.6
3	−1.81	119 nm (632–751)	−3.88	−2.43	0.00	7.43
3	−3.76	409 nm (1091–1500)	−2.76	−1.22	19.5	28.5

		Structural Parameters
Polarizer Characteristics	Transmission Band	P1	P2
Bandwidth (nm)	Visible	190	120
Bandwidth (nm)	Infrared	450	600
Max. return loss (dB)	Visible	−10	−8
Max. return loss (dB)	Infrared	−9	−12
Min. extinction ratio (dB)	Visible	7	3
Min. extinction ratio (dB)	Infrared	30	17

	( $α = - 4$ )	( $α = 0$ )	( $α = 4$ )	No Tapering
0 Diffraction order	$1.71 E + 09$	$1.55 E + 09$	$6.17 E + 08$	$6.89 E + 08$
+1 Diffraction order	$1.38 E + 08$	$1.28 E + 08$	$6.71 E + 07$	$5.39 E + 07$
−1 Diffraction order	$1.41 E + 08$	$1.29 E + 08$	$6.29 E + 07$	$5.69 E + 07$
Diffraction efficiency	75%	68%	27%	27%

	$m = 0$	$m = 1$	$m = 2$	$m = 3$	$m = 4$	$m = 5$
$f_{m}$	0.8450	0.0650	0.1240	0.0110	0.8400	5.6460
$ω_{m}$ (rad/s)	0.0000	$0.12 \times 10^{16}$	$0.68 \times 10^{16}$	$0.12 \times 10^{17}$	$0.14 \times 10^{17}$	$0.31 \times 10^{17}$
$Γ_{m}$ (rad/s)	$0.73 \times 10^{14}$	$0.59 \times 10^{16}$	$0.69 \times 10^{15}$	$0.99 \times 10^{14}$	$0.14 \times 10^{16}$	$0.37 \times 10^{16}$

Abstract

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Applied Optics