Numerical investigation of a light delivery device using metal/insulator/metal with a 3D linear taper waveguide and an input grating for heat-assisted magnetic recording

Kruawan Wongpanya; Wanchai Pijitrojana

doi:10.1364/AO.443890

Applied Optics
Vol. 60,
Issue 36,
pp. 11001-11009
(2021)
•https://doi.org/10.1364/AO.443890

Numerical investigation of a light delivery device using metal/insulator/metal with a 3D linear taper waveguide and an input grating for heat-assisted magnetic recording

Kruawan Wongpanya and Wanchai Pijitrojana

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Kruawan Wongpanya and Wanchai Pijitrojana, "Numerical investigation of a light delivery device using metal/insulator/metal with a 3D linear taper waveguide and an input grating for heat-assisted magnetic recording," Appl. Opt. 60, 11001-11009 (2021)

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- Instrumentation and Measurements
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About this Article
History
- Original Manuscript: September 21, 2021
- Revised Manuscript: November 9, 2021
- Manuscript Accepted: November 9, 2021
- Published: December 13, 2021

Abstract

Heat-assisted magnetic recording (HAMR), a new technique, we believe, to overcome the data-density limitation, uses a laser to temporarily heat a nanovolume of a recording medium. Thus, this paper proposes a light delivery device that uses the metal/insulator/metal waveguide with a three-dimensional linear taper, and a grating added for an input, for HAMR. Our structure was calculated by finite-element method simulation. By design, 830 nm of light was delivered into a ${{50}}\;{\rm{n}}{{\rm{m}}^2}$ spot area with 63% coupling efficiency, and power intensity was enhanced 930 times. This achievement potential could be applied to the HAMR system in the future.

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Data Availability

No data were generated or analyzed in the presented research.

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Parameters	Values (nm)	Definitions
$α = 30$	300	lower Au layer
$T_{L}$	100	upper gold layer thickness
$T_{U}$	200	$T_{S i O_{2}}$ layer thickness
$S i O_{2}$	5	$T_{A l_{2} O_{3}}$ layer thickness
$A l_{2} O_{3}$	205	insulator layer thickness consisting of $T_{I}$ and $T_{S i O_{2}}$
$T_{A l_{2} O_{3}}$	1000	distance from the beginning edges of the device to the first grating hole
$L_{S}$	1000	distance from the last grating hole to the taper part
$L_{G}$	4	number of grating slits
$N_{G}$	520	input grating period, namely, the distance from the center point of one hole to the center point of the next hole
$P_{G}$	220	input grating hole width
$W_{G}$	700	body width
$W_{B}$	1140	propagated length in the body, for $L_{prop}$ , $T_{I} = 205 n m$
$W_{B} = 500 n m$	3760	body length consisting of $L_{B}$ , $L_{S}$ , $3 * P_{G}$ , and $W_{G}$
$L_{G}$	605	body thickness, including $T_{B}$ , $T_{L}$ , $T_{U}$ , and $T_{S i O_{2}}$
$T_{A l_{2} O_{3}}$	20 deg	tapered angle
$α$	550	taper length from the body to the tip, which is determined by $L_{T}$
$α$	500	tip length
$L_{t}$	131	propagated length in the narrow tip for $L_{propt}$ , $h = 5 n m$
$W_{t} = 10 n m$	20	distance from the end of the taper part to the monitoring line $L_{Pt}$
$P_{t}$	10	tip width, which is equal to the hot-spot width
$W_{t}$	5	$h$ layer thickness, which is equal to the hot-spot thickness
$A l_{2} O_{3}$	405	tip thickness, including $T_{t}$ , $T_{L}$ , and $T_{U}$

NFT Design	$P_x$ (nm)	Intensity Enhancement	Coupling Efficiency (%)	FWHM Spot Size ( $P_x$ )
Circular aperture [40]	800	0.018	0.046	50 nm diameter
Nanobeak antenna [41]	785	125	8	$λ$
C-aperture [42]	700	2.42	2.1	$n m^{2}$
Lollipop [43]	870	2000	8	70 nm diameter
E-antenna [44]	780	7	14	$15 \times 20$
MIM waveguide [33]	830	30,000	82	$34 \times 39$
Antenna base hybrid plasmonic waveguide [45]	830	—	8.5	$60 \times 42$
Nanodisk antenna [46]	820	169	Pi/4	$2 \times 5$
Hybrid MIM waveguide without the grating	830	580	46	$67 \times 70$
Hybrid MIM waveguide with the grating	830	930	63	$10 \times 65$

Parameters	Values (nm)	Definitions
$α = 30$	300	lower Au layer
$T_{L}$	100	upper gold layer thickness
$T_{U}$	200	$T_{S i O_{2}}$ layer thickness
$S i O_{2}$	5	$T_{A l_{2} O_{3}}$ layer thickness
$A l_{2} O_{3}$	205	insulator layer thickness consisting of $T_{I}$ and $T_{S i O_{2}}$
$T_{A l_{2} O_{3}}$	1000	distance from the beginning edges of the device to the first grating hole
$L_{S}$	1000	distance from the last grating hole to the taper part
$L_{G}$	4	number of grating slits
$N_{G}$	520	input grating period, namely, the distance from the center point of one hole to the center point of the next hole
$P_{G}$	220	input grating hole width
$W_{G}$	700	body width
$W_{B}$	1140	propagated length in the body, for $L_{prop}$ , $T_{I} = 205 n m$
$W_{B} = 500 n m$	3760	body length consisting of $L_{B}$ , $L_{S}$ , $3 * P_{G}$ , and $W_{G}$
$L_{G}$	605	body thickness, including $T_{B}$ , $T_{L}$ , $T_{U}$ , and $T_{S i O_{2}}$
$T_{A l_{2} O_{3}}$	20 deg	tapered angle
$α$	550	taper length from the body to the tip, which is determined by $L_{T}$
$α$	500	tip length
$L_{t}$	131	propagated length in the narrow tip for $L_{propt}$ , $h = 5 n m$
$W_{t} = 10 n m$	20	distance from the end of the taper part to the monitoring line $L_{Pt}$
$P_{t}$	10	tip width, which is equal to the hot-spot width
$W_{t}$	5	$h$ layer thickness, which is equal to the hot-spot thickness
$A l_{2} O_{3}$	405	tip thickness, including $T_{t}$ , $T_{L}$ , and $T_{U}$

NFT Design	$P_x$ (nm)	Intensity Enhancement	Coupling Efficiency (%)	FWHM Spot Size ( $P_x$ )
Circular aperture [40]	800	0.018	0.046	50 nm diameter
Nanobeak antenna [41]	785	125	8	$λ$
C-aperture [42]	700	2.42	2.1	$n m^{2}$
Lollipop [43]	870	2000	8	70 nm diameter
E-antenna [44]	780	7	14	$15 \times 20$
MIM waveguide [33]	830	30,000	82	$34 \times 39$
Antenna base hybrid plasmonic waveguide [45]	830	—	8.5	$60 \times 42$
Nanodisk antenna [46]	820	169	Pi/4	$2 \times 5$
Hybrid MIM waveguide without the grating	830	580	46	$67 \times 70$
Hybrid MIM waveguide with the grating	830	930	63	$10 \times 65$

Abstract

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Tables (2)

Equations (4)

Applied Optics