Parametric device for wavelength conversion
First Claim
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1. Device for performing a parametric process according to which a pump radiation at frequency ω
-
p generates a radiation at frequency ω
g interacting with at least one signal radiation at frequency ω
s different from ω
p, comprising;
a substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprising a first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2;
an input for sending said at least one signal radiation at frequency ω
s along said substantially periodic structure;
an input for providing said pump radiation at frequency ω
p to said substantially periodic structure; and
an output suitable to extract from the device said generated radiation at frequency ω
g;
characterised in that each unitary cell also comprises a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure;
at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ
2 or χ
3 type;
at least one of the following conditions is met;
a) n1 is different from n3;
b) n2 is different from n4;
c) L1 is different from L3;
d) L2 is different from L4; and
in that n1, n2, n3, n4, L1, L2, L3, L4 are selected so as to perform the parametric process in phase matching conditions.
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Abstract
Device for performing a parametric process, comprising a substantially periodic photonic crystal structure comprising a plurality of unitary cells each comprising
- a first layer having a first refractive index n1 and a first length L1,
- a second layer having a second refractive index n2, with n1 different from n2, and a second length L2,
- a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and
- a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4,
- wherein
- at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ2 or χ3 type;
- at least one of the following conditions is met:
- a) n1 is different from n3;
- b) n2 is different from n4;
- c) L1 is different from L3;
- d) L2 is different from L4; and
- n1, n2, n3, n4, L1, L2, L3, L4 have such values as to perform the parametric process in phase matching conditions.
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Citations
22 Claims
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1. Device for performing a parametric process according to which a pump radiation at frequency ω
-
p generates a radiation at frequency ω
g interacting with at least one signal radiation at frequency ω
s different from ω
p, comprising;a substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprising a first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2;
an input for sending said at least one signal radiation at frequency ω
s along said substantially periodic structure;
an input for providing said pump radiation at frequency ω
p to said substantially periodic structure; and
an output suitable to extract from the device said generated radiation at frequency ω
g;
characterised in thateach unitary cell also comprises a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure;
at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ
2 or χ
3 type;
at least one of the following conditions is met;
a) n1 is different from n3;
b) n2 is different from n4;
c) L1 is different from L3;
d) L2 is different from L4; and
in thatn1, n2, n3, n4, L1, L2, L3, L4 are selected so as to perform the parametric process in phase matching conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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p generates a radiation at frequency ω
-
15. Optical communication line comprising an optical transmission fibre length for transmitting at least one signal radiation at frequency ω
-
s and a device, connected to said optical fibre length, for performing a parametric process according to which a pump radiation at frequency ω
p, different from ω
s, generates a radiation at frequency ω
g interacting with said at least one signal radiation at frequency ω
s, said device comprising;a substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprising a first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2;
an input for sending said at least one signal radiation at frequency ω
s along said substantially periodic structure;
an input for providing said pump radiation at frequency ω
p to said substantially periodic structure; and
an output suitable to extract from the device said generated radiation at frequency ω
g;
characterised in thateach unitary cell also comprises a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure;
at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ
2 or χ
3 type;
at least one of the following conditions is met;
a) n1 is different from n3;
b) n2 is different from n4;
c) L1 is different from L3;
d) L2 is different from L4; and
n1, n2, n3, n4, L1, L2, L3, L4 have such values as to perform the parametric process in phase matching conditions. - View Dependent Claims (16)
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s and a device, connected to said optical fibre length, for performing a parametric process according to which a pump radiation at frequency ω
-
17. Optical communication system comprising
a transmitting station for providing at least one signal radiation at frequency ω -
s;
an optical communication line, connected to said transmitting station, for transmitting said signal radiation;
a receiving station connected to said optical communication line; and
a device for performing a parametric process according to which a pump radiation at frequency ω
p, different from ω
s, generates a radiation at frequency ω
g interacting with said at least one signal radiation at frequency ω
s, said device comprisinga substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprising a first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2, an input for receiving said at least one signal radiation at frequency ω
s and send it along said substantially periodic structure;
an input for providing said pump radiation at frequency ω
p to said substantially periodic structure;
an output suitable to extract from the device said radiation generated at frequency ω
g;
characterised in thateach unitary cell also comprises a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure;
at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ
2 or χ
3 type;
at least one of the following conditions is met;
a) n1 is different from n3;
b) n2 is different from n4;
c) L1 is different from L3;
d) L2 is different from L4; and
n1, n2, n3, n4, L1, L2, L3, L4 have such values as to perform the parametric process in phase matching conditions.
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s;
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18. A substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprising:
-
a first layer having a first refractive index n1 and a first length L1;
second layer having a second refractive index n2, with n1 different from n2, and a second length L2;
a third layer having a third refractive index n3, with n3 substantially equal to n1, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 substantially equal to n2, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure;
wherein at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ
2 or χ
3 type,
the first, second, third and fourth layers are side-by-side one another in a planar element,
the first and the third layer consist of the same material, and
the second and the fourth layer consist of a gaseous element; and
wherein at least one of the following conditions is met;
a) L1 is different from L3;
b) L2 is different from L4. - View Dependent Claims (19, 20)
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21. Method for generating, through a parametric process, a radiation at frequency ω
-
g through the interaction of a pump radiation at frequency ω
p with at least one signal radiation at frequency ω
s, different from ω
p, comprising the steps of;a) supplying the radiations at frequencies ω
s and ω
p in a substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprisinga first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2, and b) supplying the radiation at frequency ω
g, generated in said structure, to an output;
characterised in thateach unitary cell also comprises a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure;
at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ
2 or χ
3 type;
at least one of the following conditions is met;
a) n1 is different from n3;
b) n2 is different from n4;
c) L1 is different from L3;
d) L2 is different from L4; and
in thatn1, n2, n3, n4, L1, L2, L3, L4 have such values as to perform the parametric process in phase matching conditions.
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g through the interaction of a pump radiation at frequency ω
-
22. A substantially periodic photonic crystal structure comprising a plurality of unitary cells that follow one other along a predetermined direction, each unitary cell comprising
a first layer having a first refractive index n1 and a first length L1, a second layer having a second refractive index n2, with n1 different from n2, and a second length L2, a third layer having a third refractive index n3, with n3 different from n2, and a third length L3 and a fourth layer having a fourth refractive index n4, with n4 different from n1 and from n3, and a fourth length L4, the periodical alternance of the first, second, third and fourth layer forming said substantially periodic photonic crystal structure; -
wherein at least one among the first, the second, the third and the fourth layers has a non-linearity of the χ
2 or χ
3 type;
the first, second, third and fourth layer are side by side to one other in a planar element;
the first and the third layer consist of the same material;
the second and the fourth layer consist of a gaseous element, and wherein at least one of the following conditions is met;
a) n2 is different from n4;
b) L1 is different from L3;
c) L2 is different from L4.
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Specification