Measuring the orbital angular momentum spectrum of an electron beam

被引：78

作者：

Grillo, Vincenzo ^{[1
,2
]}

Tavabi, Amir H. ^{[3
]}

Venturi, Federico ^{[1
,4
]}

Larocque, Hugo ^{[5
]}

Balboni, Roberto ^{[6
]}

Gazzadi, Gian Carlo ^{[1
]}

Frabboni, Stefano ^{[1
,4
]}

Lu, Peng-Han ^{[3
]}

Mafakheri, Erfan ^{[4
]}

Bouchard, Frederic ^{[5
]}

Dunin-Borkowski, Rafal E. ^{[3
]}

Boyd, Robert W. ^{[5
,7
]}

Lavery, Martin P. J. ^{[8
]}

Padgett, Miles J. ^{[8
]}

Karimi, Ebrahim ^{[5
,9
]}

机构：

[1] CNR, Ist Nanosci, Ctr S3,Via G Campi 213-A, I-41125 Modena, Italy

[2] CNR, IMEM, Parco Area Sci 37-A, I-43124 Parma, Italy

[3] Forschungszentrum Julich, Ernst Ruska Ctr Microscopy & Spect Electrons, D-52425 Julich, Germany

[4] Univ Modenae Reggio Emilia, Dipartimento FIM, Via G Campi 213-A, I-41125 Modena, Italy

[5] Univ Ottawa, Dept Phys, 25 Templeton St, Ottawa, ON K1N 6N5, Canada

[6] CNR, IMM Bologna, Via P Gobetti 101, I-40129 Bologna, Italy

[7] Univ Rochester, Inst Opt, Rochester, NY 14627 USA

[8] Glasgow Univ, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[9] Inst Adv Studies Basic Sci, Dept Phys, Zanjan 4513766731, Iran

来源：

NATURE COMMUNICATIONS | 2017年 / 8卷

基金：

欧洲研究理事会; 英国工程与自然科学研究理事会;

关键词：

VORTEX BEAMS; STATES;

D O I：

10.1038/ncomms15536

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Electron waves that carry orbital angular momentum (OAM) are characterized by a quantized and unbounded magnetic dipole moment parallel to their propagation direction. When interacting with magnetic materials, the wavefunctions of such electrons are inherently modified. Such variations therefore motivate the need to analyse electron wavefunctions, especially their wavefronts, to obtain information regarding the material's structure. Here, we propose, design and demonstrate the performance of a device based on nanoscale holograms for measuring an electron's OAM components by spatially separating them. We sort pure and superposed OAM states of electrons with OAM values of between -10 and 10. We employ the device to analyse the OAM spectrum of electrons that have been affected by a micron-scale magnetic dipole, thus establishing that our sorter can be an instrument for nanoscale magnetic spectroscopy.

引用

页数：6

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