Highly enhanced hard x-ray emission from oriented metal nanorod arrays excited by intense femtosecond laser pulses

Sudipta Mondal; Indrani Chakraborty; Saima Ahmad; Daniel Carvalho; Prashant Singh; Amit D. Lad; V. Narayanan; Pushan Ayyub; G. Ravindra Kumar; J. Zheng; Z. M. Sheng

doi:10.1103/PhysRevB.83.035408

Highly enhanced hard x-ray emission from oriented metal nanorod arrays excited by intense femtosecond laser pulses

Sudipta Mondal^*, Indrani Chakraborty, Saima Ahmad, Daniel Carvalho, Prashant Singh, Amit D. Lad, V. Narayanan, Pushan Ayyub, G. Ravindra Kumar, J. Zheng, Z. M. Sheng

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We report a 43-fold enhancement in the hard x-ray emission (in the 150-300 keV range) from copper nanorod arrays (compared to a polished Cu surface) when excited by 30-fs, 800-nm laser pulses with an intensity of 1016 W/cm2. The temperature of the hot electrons that emit the x rays is 11 times higher. Significantly, the x-ray yield enhancement is found to depend on both the aspect ratio as well as the cluster size of the nanorods. We show that the higher yield arises from enhanced laser absorption owing to the extremely high local electric fields around the nanorod tips. Particle-in-cell plasma simulations reproduce these observations and provide pointers to further optimization of the x-ray emission.

Original language	English
Article number	035408
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevB.83.035408
State	Published - 14 Jan 2011
Externally published	Yes

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Mondal, S., Chakraborty, I., Ahmad, S., Carvalho, D., Singh, P., Lad, A. D., Narayanan, V., Ayyub, P., Kumar, G. R., Zheng, J., & Sheng, Z. M. (2011). Highly enhanced hard x-ray emission from oriented metal nanorod arrays excited by intense femtosecond laser pulses. Physical Review B - Condensed Matter and Materials Physics, 83(3), Article 035408. https://doi.org/10.1103/PhysRevB.83.035408

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title = "Highly enhanced hard x-ray emission from oriented metal nanorod arrays excited by intense femtosecond laser pulses",

abstract = "We report a 43-fold enhancement in the hard x-ray emission (in the 150-300 keV range) from copper nanorod arrays (compared to a polished Cu surface) when excited by 30-fs, 800-nm laser pulses with an intensity of 1016 W/cm2. The temperature of the hot electrons that emit the x rays is 11 times higher. Significantly, the x-ray yield enhancement is found to depend on both the aspect ratio as well as the cluster size of the nanorods. We show that the higher yield arises from enhanced laser absorption owing to the extremely high local electric fields around the nanorod tips. Particle-in-cell plasma simulations reproduce these observations and provide pointers to further optimization of the x-ray emission.",

author = "Sudipta Mondal and Indrani Chakraborty and Saima Ahmad and Daniel Carvalho and Prashant Singh and Lad, {Amit D.} and V. Narayanan and Pushan Ayyub and Kumar, {G. Ravindra} and J. Zheng and Sheng, {Z. M.}",

year = "2011",

month = jan,

day = "14",

doi = "10.1103/PhysRevB.83.035408",

language = "אנגלית",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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Mondal, S, Chakraborty, I, Ahmad, S, Carvalho, D, Singh, P, Lad, AD, Narayanan, V, Ayyub, P, Kumar, GR, Zheng, J & Sheng, ZM 2011, 'Highly enhanced hard x-ray emission from oriented metal nanorod arrays excited by intense femtosecond laser pulses', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 3, 035408. https://doi.org/10.1103/PhysRevB.83.035408

TY - JOUR

T1 - Highly enhanced hard x-ray emission from oriented metal nanorod arrays excited by intense femtosecond laser pulses

AU - Mondal, Sudipta

AU - Chakraborty, Indrani

AU - Ahmad, Saima

AU - Carvalho, Daniel

AU - Singh, Prashant

AU - Lad, Amit D.

AU - Narayanan, V.

AU - Ayyub, Pushan

AU - Kumar, G. Ravindra

AU - Zheng, J.

AU - Sheng, Z. M.

PY - 2011/1/14

Y1 - 2011/1/14

N2 - We report a 43-fold enhancement in the hard x-ray emission (in the 150-300 keV range) from copper nanorod arrays (compared to a polished Cu surface) when excited by 30-fs, 800-nm laser pulses with an intensity of 1016 W/cm2. The temperature of the hot electrons that emit the x rays is 11 times higher. Significantly, the x-ray yield enhancement is found to depend on both the aspect ratio as well as the cluster size of the nanorods. We show that the higher yield arises from enhanced laser absorption owing to the extremely high local electric fields around the nanorod tips. Particle-in-cell plasma simulations reproduce these observations and provide pointers to further optimization of the x-ray emission.

AB - We report a 43-fold enhancement in the hard x-ray emission (in the 150-300 keV range) from copper nanorod arrays (compared to a polished Cu surface) when excited by 30-fs, 800-nm laser pulses with an intensity of 1016 W/cm2. The temperature of the hot electrons that emit the x rays is 11 times higher. Significantly, the x-ray yield enhancement is found to depend on both the aspect ratio as well as the cluster size of the nanorods. We show that the higher yield arises from enhanced laser absorption owing to the extremely high local electric fields around the nanorod tips. Particle-in-cell plasma simulations reproduce these observations and provide pointers to further optimization of the x-ray emission.

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DO - 10.1103/PhysRevB.83.035408

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SN - 1098-0121

VL - 83

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 3

M1 - 035408

ER -

Highly enhanced hard x-ray emission from oriented metal nanorod arrays excited by intense femtosecond laser pulses

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