Suspended core microstructured optical fibers with diverse arrangements of gold-filled holes: study of the polarization characteristics and resonance strength

Rajat Kumar Basak; Debashri Ghosh

doi:10.1364/JOSAB.36.003364

Journal of the Optical Society of America B
Vol. 36,
Issue 12,
pp. 3364-3371
(2019)
•https://doi.org/10.1364/JOSAB.36.003364

Suspended core microstructured optical fibers with diverse arrangements of gold-filled holes: study of the polarization characteristics and resonance strength

Rajat Kumar Basak and Debashri Ghosh

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Rajat Kumar Basak and Debashri Ghosh, "Suspended core microstructured optical fibers with diverse arrangements of gold-filled holes: study of the polarization characteristics and resonance strength," J. Opt. Soc. Am. B 36, 3364-3371 (2019)

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Abstract

We study the dispersion and polarization properties as well as the coupling characteristics of suspended core microstructured optical fibers (SC-MOFs) having constant pitch and air-filling fraction with a varying suspension factor (SF) and diverse arrangements of gold-filled holes. The interaction between the core-guided fundamental mode and the surface plasmon polaritons (SPPs) generated on the surface of the gold-filled hole creates surface plasmon resonance (SPR) at the phase-matching wavelengths. It is observed that such plasmonic SC-MOF designs exhibit very high birefringence and an increased number of complete coupling points for high SF values. In addition, for all the arrangements of gold-filled holes, the coupling occurs for a higher order of the SPP for structures having greater SF. The resonance strength of such SC-MOFs is significantly enhanced and considerable reduction in full width at half maximum (FWHM) bandwidth of the SPR peak is achieved for the ${ x}$-axis with suitable arrangement of gold-filled holes. The values of the coupling strength and FWHM achieved for the proposed SC-MOF structures are better compared to all the data reported until now to the best of our knowledge. The results suggest that such SC-MOF structures may be beneficial for developing polarizers or in-fiber polarization splitters with improved performance.

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$λ_{S P R}$ (in µm)
$S F = 0.8$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${n} = {2}$	${n} = {3}$		${n} = {4}$	${n} = {5}$
$x$	1.212	0.973		0.799	0.717
$y$	1.329	0.926		0.804	0.723
$SF = 1.1$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${ n} = {2}$	$n = 3$	$n = 4$	$n = 5$	$n = 6$
$x$	1.307	1.089	0.855	0.748	0.691
$y$	–	1.005	0.853	0.759	0.692
${SF}\; = \;{1.4}$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${ n} = {3}$	${n} = {4}$	${n} = {5}$	${n} = {6}$	${n} = {7}$
$x$	1.156	0.964	0.824	0.734	0.681
$y$	1.376	0.995	0.827	0.741	0.685

$λ_{S P R}$ (in µm)
${SF}\; = \;{ 0.8}$
Polarization	Complete Coupling			Incomplete Coupling
Polarization		${n} = {2}$	${n} = {3}$	${n} = {3}$	${n} = {4}$	${n} = {5}$
$x$		1.143	1.004	0.925	0.810	0.723
$x$		1.282	1.004	0.925	0.810	0.723
$y$		1.449	1.013	0.954	0.850	–
${SF}\; = \;{1.1}$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${n} = {2}$	${n} = {3}$	${n} = {4}$	${n} = {4}$	${n} = {5}$	${n} = {6}$
$x$	1.240	0.993	0.858	–	0.748	0.691
$x$	1.417	1.118	0.858	–	0.748	0.691
$y$	–	1.023	0.899	0.859	0.789	–
$y$	–	1.112	0.899	0.859	0.789	–
${SF}\; = \;{ 1.4}$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${n} = {3}$	${n} = {4}$	${n} = {5}$	${n} = {5}$	${n} = {6}$	${n} = {7}$
$x$	1.147	0.890	0.818	–	0.729	0.681
$x$	1.213	0.963	0.818	–	0.729	0.681
$y$	1.036	0.865	–	0.810	0.735	–
	1.064	0.865	–	0.810	0.762	–

$λ_{S P R}$ (in µm)
${SF}\; = \;{0.8}$
	Complete Coupling			Incomplete Coupling
Polarization	${n} = {2}$	${n} = {3}$		${n} = {4}$	$n = 5$
$x$	1.211	0.976		0.800	0.718
$y$	—	0.939		0.808	0.726
${SF}\; = \;{1.1}$
	Complete Coupling			Incomplete Coupling
Polarization	${n} = {2}$	${n} = {3}$	${n} = {4}$	${n} = {5}$	${n} = {6}$
$x$	1.277	1.106	0.859	0.749	0.691
$y$	—	1.045	0.869	0.764	0.695
${SF}\; = \;{1.4}$
	Complete Coupling				Incomplete Coupling
Polarization	${n} = {3}$	${n} = {4}$	${n} = {5}$	${n} = {6}$	${n} = {7}$
$x$	1.133	0.980	0.834	0.736	0.682
$y$	—	0.989	0.843	0.759	0.691

Single Gold-Filled Hole
SF value	$λ_{S P R}$ (µm)	Resonance Strength (dB/cm)	FWHM (nm)
0.8	0.973	1452.16	15
1.1	0.855	1913.64	16
1.4	0.824	3244.04	20
Adjacent Two Gold-Filled Holes
SF value	$λ_{S P R}$ (µm)	Resonance Strength (dB/cm)	FWHM (nm)
0.8	1.004	1168.69	25
1.1	0.993	1653.19	16
1.4	0.818	3482.67	12
Opposite Two Gold-Filled Holes
SF value	$λ_{S P R}$ (µm)	Resonance Strength (dB/cm)	FWHM (nm)
0.8	0.976	1492.43	31
1.1	0.859	2607.41	25
1.4	0.736	4300.02	15

$λ_{S P R}$ (in µm)
$S F = 0.8$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${n} = {2}$	${n} = {3}$		${n} = {4}$	${n} = {5}$
$x$	1.212	0.973		0.799	0.717
$y$	1.329	0.926		0.804	0.723
$SF = 1.1$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${ n} = {2}$	$n = 3$	$n = 4$	$n = 5$	$n = 6$
$x$	1.307	1.089	0.855	0.748	0.691
$y$	–	1.005	0.853	0.759	0.692
${SF}\; = \;{1.4}$
Polarization	Complete Coupling			Incomplete Coupling
Polarization	${ n} = {3}$	${n} = {4}$	${n} = {5}$	${n} = {6}$	${n} = {7}$
$x$	1.156	0.964	0.824	0.734	0.681
$y$	1.376	0.995	0.827	0.741	0.685

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Equations (1)

Journal of the Optical Society of America B