光近接場デバイスを用いた光誘起相互作用

デイリー, マーク; Daly, Mark

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光近接場デバイスを用いた光誘起相互作用

https://doi.org/10.15102/1394.00000167

名前 / ファイル	ライセンス	アクション
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Final Exam Abstract (42.9 kB)

Item type

学位論文 / Thesis or Dissertation(1)

公開日

2017-12-21

タイトル

光近接場デバイスを用いた光誘起相互作用

言語

タイトル

Light-Induced Interactions using Optical Near-Field Devices

言語

eng

資源タイプ

資源タイプ識別子

http://purl.org/coar/resource_type/c_db06

資源タイプ

doctoral thesis

ID登録

10.15102/1394.00000167

ID登録タイプ

JaLC

アクセス権

open access

アクセス権URI

http://purl.org/coar/access_right/c_abf2

著者

デイリー, マーク

著者　(英)

Daly, Mark

抄録

内容記述タイプ

Other

内容記述

Optical near-fields are generated when light passes through components with wavelength, or subwavelength features. The near-fields generated at the surfaces of devices are often neglected, in part because the far-fields have more applications and are more readily accessible. Near-fields, as one might expect, occur very close to the surface of the material through which the light passes. However, near-fields present an interesting method of overcoming Rayleigh's diffraction limit. For example, the evanescent field at the surface of a prism or ultrathin fibre rapidly decays, but can exist in sub-diffraction limited areas. Similarly, the field generated by a subwavelength aperture or a plasmonic particle can have local field distributions with minute dimensions, allowing one to confine light to areas otherwise unattainable, extremely close to the surface of the material in question. By exploiting this aspect of optical near-fields we apply them to problems in atom and particle trapping.
Our main focus is on ultrathin optical fibres. These fibres differ from telecommunications fibre due to their lack of cladding material and their wavelength-scale dimensions. These two factors combine to produce a significant evanescent field at their waist. This field is readily accessible and can be used to trap particle or atoms through the optical forces which arise in such light-matter interactions. We can also use such devices to passively collect light which is emitted into the available guided mode. Here, we demonstrate how an ultrathin fibre can be used as a probe to determine the temperature of a cold atom cloud.
Ultrathin fibres, while extremely useful, have some limiting factors related to the strength and distribution of their evanescent fields. To improve upon the design, we also investigated how one can nanostructure an optical fibre using focussed ion beam milling techniques or combine optical fibres with gold dimer arrays to produce localised field enhancements. We used nanostructured fibres to trap 100 and 200 nm dielectric spheres within the structured region. Various numerical techniques were employed to characterise both the nanostructured fibre and the plasmonic-enhanced fibre.
Aside from optical fibres, we also briefy discuss how an array of Fresnel microlenses can be packaged with other atom chip designs to produce a device which could trap atoms microns away from a gold surface. We discuss the theory and fabrication technique for such a Fresnel microlens array atom chip.

言語

口頭試問日

2016-12-16

学位授与年月日

2017-03-10

学位名

Doctor of Philosophy

学位授与番号

甲第1号

学位授与機関

学位授与機関識別子Scheme

kakenhi

学位授与機関識別子

38005

学位授与機関名

Okinawa Institute of Science and Technology Graduate University

著者版フラグ

出版タイプ

VoR

出版タイプResource

http://purl.org/coar/version/c_970fb48d4fbd8a85

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2023-06-26 12:08:52.089086

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光近接場デバイスを用いた光誘起相互作用

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× Daly, Mark

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