The nano Rectenna Project !"#$%&'# )*&+ ,"-&+#" .&'/01'2$''& 3"24 5"64 7&#"&8/' 9:;"$';< /-$= 24$ >'?=&=$# @=$A*$';< B&'# "##$ %&'( )*+ ,-./ 01)2 34511& 16 70/.4)& 7*2.*##/.*2 9#& ,$.$ :*.$#/;.8<= 9#& ,$.$ >??@A= %;/)#& 1 The nano Rectenna Project Project team: Prof. Yael Hanein Prof. Koby Scheuer Prof. Amir Boag Dr. Inbal Friedler Yuval Ifat Doron Bar-Lev Zeev Iluz Michal Eitan 2
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The nano Rectenna Project
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The nano Rectenna Project
Project team: ! Prof. Yael Hanein
! Prof. Koby Scheuer
! Prof. Amir Boag
! Dr. Inbal Friedler
! Yuval Ifat
! Doron Bar-Lev
! Zeev Iluz
! Michal Eitan 2
The nano Rectenna Project
Outline ! The motivation: energy harvesting using optical
antennas
! Guidelines for efficient IR rectenna
! The Dual Vivaldi antenna geometry
! Antenna performance - simulation results
! Summary
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The nano Rectenna Project
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The motivation: energy harvesting using optical antennas ,*<!1BC4)&!/#48#**)!;<;8#-!D.&&!.*4&'+#E!
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The nano Rectenna Project
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Guidelines for efficient IR rectenna
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The nano Rectenna Project
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• Skin depth ~ 13 nm in IR band
• Antenna thickness > 40-50 nm 6
The nano Rectenna Project
The Dual Vivaldi antenna geometry
zx
( )end end,x z
( )start start,x z
1 25 nmW =
250 nmL =
2 500 nmW =
• H+&II";&+(,"-&+#"(0(I+/2(&'2$''&(3"24($JF/'$'8&+(2&F$=((• K!B("LF$#&';$(L&2;4"'6(• 9'#0M=$(=&#"&8/'(• N*=(&FF=/&;4O((23/($'#0M=$(,"-&+#"(&'2$''&IP(F+&;$#(/FF/I"2$(2/(/'$(&'/24$=(• Q$&E(6&"'(&2(24$(&'2$''&(%=/&#I"#$(#"=$;8/'R( 7
The nano Rectenna Project
D"L*+&8/'(G$/L$2=<(
_')/8(!;'O;8/)8#!!2 2 1µm! ![')&Z^.$)&+.!)*8#**)!
-)+#!16!21&+G!95.4]*#;;!`!!FIT!*-!
8
7)45!)*8#**)!;.+#!.;!.*8#2/)8#+!D.85!B)/)&&#&!B&)8#!D)$#2'.+#!!
The nano Rectenna Project
95#!;.-'&)C1*E!L39!\U3!Z!a.*.8#!7&#-#*8;!a/#b'#*4<
The nano Rectenna Project
Dual Vivaldi Antenna: Simulation results
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The return loss > 9.5 dB between (129% impedance bandwidth).
0.7 3.25µm!
The nano Rectenna Project
95#
The nano Rectenna Project
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J1*!;<--#8/.4!6)/ZK#&+!B)e#/*!+'#!81!85#!_')/8(!;'O;8/)8#!
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95#!#0/.4!*#)/!K#&+!+.;8/.O'C1*!)8!!
a)/ZK#&+!+./#4C$.8<!B)e#/*;!.*!85#!<Zc!V$#/C4)&Y!)*+!<Z(!V51/.(1*8)&Y!B&)*#;!
1.58µm
The nano Rectenna Project
^#/<!211+!.-B#+)*4#!O)*+D.+85=!O'8!D5)8!)O1'8!/)+.)C1*!#X4.#*4<!f!
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95#!/)+.)C1*!#X4.#*4<=!+#K*#+!);!85#!/)+.)8#+!81!)44#B8#+!V.*B'8Y!B1D#/!/)C1=!.;!)!4/.C4)&!B)/)-#8#/!+'#!81!85#!&1;;#;!.*!-#8)&;!)8!%H!6/#b'#*4.#;G!
The nano Rectenna Project
C4$()*&+(,"-&+#"(=&#"&8/'($:;"$';<(
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The radiation efficiency remains higher than 85% between (122% efficiency bandwidth). 0.78 3.23µm!
The nano Rectenna Project
C4$()*&+(,"-&+#"(=&#"&8/'($:;"$';<(
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The radiation efficiency remains higher than 85% between (122% efficiency bandwidth). 0.78 3.23µm!
The nano Rectenna Project
Array configuration for Power harvesting
Series DC connection – no need for DC interconnects
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The nano Rectenna Project
Summary • Dual Vivaldi nano-antenna • Wideband both in terms of impedance matching and
radiation efficiency. • The high efficiency - concentration of the field in the gap
between the antenna terminals & gradual transition from the wave guiding to radiation.
• The broadside peak radiation - integration of dual Vivaldi antennas in planar configurations, using E-beam lithography process.
• The Dual Vivaldi antenna: fewer fabrication restrictions as compared to dipole and bow-tie antennas, especially in terms of the nano-gap size between the antenna terminals.
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