Single photon detector based on polarization unrelated frequency up-conversion

A single-photon detector and frequency technology, applied in the field of optoelectronics, can solve problems such as polarization sensitivity, and achieve the effect of simple production process and completely polarization-independent effect.

Inactive Publication Date: 2011-08-10
NANJING UNIV
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Problems solved by technology

This control method has the same conversion ability for signal light with any polarization, which solves the current polarization-sensitive problem of sing

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  • Single photon detector based on polarization unrelated frequency up-conversion
  • Single photon detector based on polarization unrelated frequency up-conversion
  • Single photon detector based on polarization unrelated frequency up-conversion

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Embodiment 1

[0035] In order to ensure that the single photon detector works in the communication band, set the signal light wavelength to 1550nm and the light intensity to 0.2MW / cm 2 , the pump light wavelength is 1064nm, and the light intensity is 10MW / cm 2 . According to the quasi-phase matching condition, the reciprocal lattice vector provided by the periodic structure of the first and fourth parts is used to compensate the wave vector mismatch of the frequency up-conversion, setting l A =11.62μm; the reciprocal lattice vector provided by the periodic structure in the second part is used to compensate the wavevector mismatch of the polarization coupling of the signal light, setting l B =20.48μm; the reciprocal lattice vector provided by the periodic structure in the third part is used to compensate the wavevector mismatch of the polarization coupling with frequency light, setting l C = 7.27 μm. To completely convert signal light into sum frequency light, set N A =500, the length of...

Embodiment 2

[0037] In order to ensure that the single photon detector works in the communication band, set the signal light wavelength to 1550nm and the light intensity to 0.2MW / cm 2 , the pump light wavelength is 1064nm, and the light intensity is 10MW / cm 2 . According to the quasi-phase matching condition, the reciprocal lattice vector provided by the periodic structure of the first and fourth parts is used to compensate the wave vector mismatch of the frequency up-conversion, setting l A =11.62μm; the reciprocal lattice vector provided by the periodic structure in the second part is used to compensate the wavevector mismatch of the polarization coupling of the signal light, setting l B =20.48μm; the reciprocal lattice vector provided by the periodic structure in the third part is used to compensate the wavevector mismatch of the polarization coupling with frequency light, setting l C = 7.27 μm. To completely convert signal light into sum frequency light, set N A =500, the length of...

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Abstract

The invention relates to a signal photon detector based on polarization unrelated frequency up-conversion; the signal photon detector comprises a lithium niobate crystal which is formed by periodically superposing four parts and is periodically polarized, wherein for a first part and a fourth part, the periodic structures are same, the period length is lA and meets the quasi-phase matching condition of frequency up-conversion, and the period number is NA so that all signal lights can be converted into sum frequency lights; a second part is in a periodic structure used by reciprocal lattice vectors for compensating mismatching of wave vectors coupled and polarized by signal lights, and the period length is lB and meets the phase matching condition of signal light polarization rotation; and a third part is in a periodic structure used by reciprocal lattice vectors for compensating mismatching of wave vectors coupled and polarized by sum frequency lights, the period length is lC and meets the phase matching condition of signal light polarization rotation. An external direct-current power supply is applied to y-surfaces of the second part and the third part of a sample so as to realize the periodic modulation of optical coefficients, thereby leading the polarization direction of corresponding light waves to rotate. The signal photon detector is practicable in preparation and has wide application prospect in fields of quantum communication and photo-communication.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to the electro-optic interaction in a periodically poled lithium niobate (PPLN) superlattice, and the design of a novel polarization-independent single-photon detector based on the interaction. More specifically, it is a polarization-independent single-photon detector designed by rotating the polarization direction of the corresponding light wave through the electro-optical effect so that any polarized signal light can be completely converted into sum-frequency light. Background technique [0002] In the past few years, quantum information technology has developed rapidly and has become the focus of attention in the fields of physics and informatics. In this technology, single-photon detection is again the key. According to the particle nature of light, light is composed of a large number of photons, and the energy of photons is determined by the frequency of light. The en...

Claims

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Application Information

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IPC IPC(8): G01J11/00H01L31/101G02F1/03G02F1/37
Inventor 陆延青宋晓诗王琴徐飞于子砚胡伟
Owner NANJING UNIV
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