Hybrid plasmonic waveguide with centimeter-scale propagation length for nanoscale optical confinement

Sandeep Dahiya; Suresh Kumar; B. K. Kaushik

doi:10.1364/AO.55.010341

Applied Optics
Vol. 55,
Issue 36,
pp. 10341-10346
(2016)
•https://doi.org/10.1364/AO.55.010341

Hybrid plasmonic waveguide with centimeter-scale propagation length for nanoscale optical confinement

Sandeep Dahiya, Suresh Kumar, and B. K. Kaushik

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Sandeep Dahiya, Suresh Kumar, and B. K. Kaushik, "Hybrid plasmonic waveguide with centimeter-scale propagation length for nanoscale optical confinement," Appl. Opt. 55, 10341-10346 (2016)

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- Optoelectronics
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The topics in this list come from the Optics and Photonics Topics applied to this article.

About this Article
History
- Original Manuscript: August 22, 2016
- Revised Manuscript: November 19, 2016
- Manuscript Accepted: November 19, 2016
- Published: December 16, 2016

Abstract

A centimeter-scale hybrid plasmonic waveguide (HPW) structure based on a grating is proposed at telecom wavelengths. The high-contrast grating is formed by Si and air placed in an air slot created in the high-index region for attaining nanoscale optical confinement. High-contrast gratings help enhance the propagation length up to 3.6 cm with very low loss of $0.11 dB / mm$ . Further, the extremely large figure of merit 1,129,623 ( $> 10^{7}$ ) with nanoscale confinement of $0.00081 / {μm}^{2}$ is introduced. In the present work, finite-element-method-based COMSOL Multiphysics software was applied to simulate and analyze the properties of a HPW structure. The proposed HPW device can be used for next-generation applications of nanolasers and modulators.

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$a$ (nm)	$b$ (nm)	Grating Period (nm)	$n_{eff}$ (Real)	$n_{eff}$ (Imag.)	$L_{prop.}$ (cm)	$L_{m}$ (dB/mm)	$A_{m} (/ {μm}^{2})$	FoM
150	40	190	2.59	0.000017	0.73	0.59	0.0015	165,968
200	55	255	2.60	0.000024	0.51	0.84	0.0013	126,282
230	65	295	2.62	0.0000034	3.6	0.11	0.00081	1,129,623
270	80	350	2.62	0.0000046	2.7	0.16	0.0011	716,308
300	90	390	2.62	0.0000051	2.4	0.17	0.0005	958,530
350	100	450	2.61	0.0000048	2.6	0.16	0.00057	897,518
390	115	505	2.60	0.000069	0.18	2.4	0.00010	158,328

Air Gap (nm)	Width Si (nm)	Duty Cycle	$n_{eff}$ (Real)	$n_{eff}$ (Imag.)	$L_{prop.}$ (cm)	$L_{m}$ (dB/mm)	$A_{m} (/ {μm}^{2})$	FoM
95	200	0.32	2.58	0.00012	0.1	4.2	0.00049	41,116
120	175	0.40	2.62	0.0007	0.02	24	0.0008	5513
150	145	0.51	2.63	0.00020	0.06	7	0.0004	27,295
180	115	0.61	2.62	0.000042	0.29	1.4	0.00045	122,626
200	95	0.67	2.61	0.000035	0.35	1.2	0.000086	336,683
230	65	0.78	2.62	0.0000034	3.6	0.11	0.00081	1,129,623
255	40	0.86	2.62	0.0000044	2.8	0.15	0.0011	748,846

$a$ (nm)	$b$ (nm)	Grating Period (nm)	$n_{eff}$ (Real)	$n_{eff}$ (Imag.)	$L_{prop.}$ (cm)	$L_{m}$ (dB/mm)	$A_{m} (/ {μm}^{2})$	FoM
150	40	190	2.59	0.000017	0.73	0.59	0.0015	165,968
200	55	255	2.60	0.000024	0.51	0.84	0.0013	126,282
230	65	295	2.62	0.0000034	3.6	0.11	0.00081	1,129,623
270	80	350	2.62	0.0000046	2.7	0.16	0.0011	716,308
300	90	390	2.62	0.0000051	2.4	0.17	0.0005	958,530
350	100	450	2.61	0.0000048	2.6	0.16	0.00057	897,518
390	115	505	2.60	0.000069	0.18	2.4	0.00010	158,328

Air Gap (nm)	Width Si (nm)	Duty Cycle	$n_{eff}$ (Real)	$n_{eff}$ (Imag.)	$L_{prop.}$ (cm)	$L_{m}$ (dB/mm)	$A_{m} (/ {μm}^{2})$	FoM
95	200	0.32	2.58	0.00012	0.1	4.2	0.00049	41,116
120	175	0.40	2.62	0.0007	0.02	24	0.0008	5513
150	145	0.51	2.63	0.00020	0.06	7	0.0004	27,295
180	115	0.61	2.62	0.000042	0.29	1.4	0.00045	122,626
200	95	0.67	2.61	0.000035	0.35	1.2	0.000086	336,683
230	65	0.78	2.62	0.0000034	3.6	0.11	0.00081	1,129,623
255	40	0.86	2.62	0.0000044	2.8	0.15	0.0011	748,846

Abstract

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Equations (4)

Applied Optics