• Title, Summary, Keyword: Near-field optical recording(근접장 광기록)

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A study on light propagation in near-field optical probes (근접장 광학 탐침내의 도파에 관한 연구)

  • 정승태;신동재;이용희
    • Proceedings of the Optical Society of Korea Conference
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    • pp.162-163
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    • 2000
  • 근접장 주사 광학 현미경(Near-field scanning optical microscope)에서 가장 중요한 부분은 바로 근접장 탐침(Near-field optical probe)이다. 가간 널리 사용되는 근접장 탐침은 끝 부분에 매우 작은 구멍만 남기고 나머지 부분은 금속으로 코팅한 뾰족한 광섬유(Metal-clad tapered optical fiber)이다. 탐침의 끝에 형성된 작은 구멍은 진행하지 못하는 근접장(Near-field)을 진행하는 먼장(Far-field)으로 바꾸어줌으로서 회절한계를 뛰어넘는 분해능을 가능하게 한다. 그러나, 이러한 작은 구멍은 매우 작은 투과 효율(Transmission efficiency)을 가지기 때문에 고밀도 광기록(High-density optical recording)등에 이용하는데 큰 어려움이 있었다.$^{(1).(3)}$ 따라서 금속이 코팅된 뾰족한 광섬유 내에서 빛이 어떻게 진행되는지에 대한 연구를 통해 보다 높은 효율을 가지는 근접장 탐침을 개발하는 것이 중요한 과제가 되고 있다. 본 연구에서는 금속이 코팅된 뾰족한 광섬유 도파로 내에서 구멍의 크기와 빛의 투과 효율의 관계를 보고한다. (중략)

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Design and Evaluation of An Electromagnetic Driven Actuator for Near-field Optical Recording System (근접장 광기록 시스템용 전자기구동 액추에이터의 설계 및 평가)

  • 김석중;이용훈;이철우;서중언
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.11
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    • pp.2732-2741
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    • 2000
  • Combination of magnetic recording technology and optical recording technology such as Near Field Optical Recording is watched recently. In order to accomplish this technology, the development of an electromagnetic driven mm-sized mirror shifting laser beam in track direction have to needed. In Near Field Optical Recording System, shifting laser beam in track direction mean as fine tracking and means as coarse tracking. Therefore in Near Field Optical Recording, 2-stage actuator is composed of servo controller in reading or recording information on disc layer. In our research, through design and simulation process of driven mm-sized mirror, we arrange systematically design process of driven mm-sized mirror having good frequency transfer characteristics. Design and simulation processes included modal analysis of spring, calculation of magnetic moment according to the number of turns and geometric configuration of coil and magnetic circuit analysis meaning that calculation of magnetic flux density in air gap of magnetic circuit. After that we design and make parts of driven mm-sized mirror, assemble and evaluate our electriomagnetic driven mm-sized mirror. we compared design values with actual characteristic values and present solution scheme. Through these processes we performed manufacturing of an electromagnetic driven mm-sized mirror having good frequency-domain characteristics and high sensitivity characteristics.

A Study on the Evaluation of the Optical Head of a Near-field Optical Recording System and Interference Pattern Analysis (근접장 광기록 헤드의 광학적 성능 평가와 정렬 오차에 대한 간섭 무늬 패턴 분석에 대한 연구)

  • Yoon Hyoung Kil;Gweon Dae Gab;Lee Jun Hee;Jung Jae Hwa;Oh Hyung Ryeol
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.5
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    • pp.80-86
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    • 2005
  • Optical performance evaluation results and an interference fringe pattern analysis of alignment errors for an optical head of a near-field receding (NFR) system are presented. The focusing unit is an optical head of a NFR system and is composed of a solid immersion lens (SIL) and an objective lens (OL). Generally, the size of the focusing unit is smaller than that of the conventional optical recording head. Hence there are difficulties to assemble the small focusing unit precisely. We composed an evaluation system with an interferometer and evaluated some focusing unit samples aligned and assembled by manual and present the obtained results. Using the conventional optical tool, Code V, a tolerance analysis of the alignment error between the SIL and the objective lens and an interference pattern analysis for the assembly error are executed. Then, through an analysis of the simulation results, the conceptual auto-alignment methodology using a neural network approach is considered.

Design of Elliptic Solid Immersion Lens for Dual Layer Near Field Recording (미디어 내부 2층 근접장 광기록을 위한 타원형상 고체침지렌즈의 설계)

  • Kim, Wan-Chin;Choi, Hyun;Song, Tae-Sun;Park, No-Cheol;Park, Young-Pil
    • Transactions of the Society of Information Storage Systems
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    • v.2 no.4
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    • pp.219-223
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    • 2006
  • Near field recording(NFR) technology has been considered as a strong candidate to surpass the far-field diffraction limit imposed by the nature of light in present optical disk drives such as CD, DVD, and BD(Blu-ray Disk). In this paper, we suggest novel inside near-field dual layer recording concept using elliptic shape solid immersion lens(ESIL).

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Design of Cover Layer Incident Dual-Layer Near-Field Recording Optics with Hemispherical SIL (반구형 SIL을 이용한 미디어 내부 이층 근접장 광 기록계의 설계)

  • Choi, Hyun;Kim, Wan-Chin;Song, Tae-Sun;Park, No-Cheol;Park, Young-Pil
    • Transactions of the Society of Information Storage Systems
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    • v.2 no.1
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    • pp.13-20
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    • 2006
  • In this paper, we propose novel optics design for media inside near-field recording(NFR) using hemispherical solid immersion lens(HMS). To obtain strong advantage of data protection and high data capacity simultaneously, HMS based near field optics using aplanatic position of super hemisphere is designed. In this design, to improve small optical tolerance of this aplanatic position, additional aspheric lens surface is added on top of the HMS and it is combined with zoom optics which composed of two single lenses having low numerical aperture(NA). Also, to compensate chromatic aberration which happens seriously in optics using blue laser diode, diffractive optical element is used. Using zoom optics, additional aspheric lens surface, and diffractive optical element together, wavefront aberration and chromatic aberration are effectively reduced in broad range of cover layer thickness and wavelength variation. In addition, in this paper, effect of gap induced aberration is investigated by analyzing different behavior of each TM and TE wave for designed media inside dual-layer NFR optics.

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Design of Cover Layer Incident Dual-Layer Near-Field Recording Optics with Hemispherical SIL (반구형 SIL을 이용한 미디어 내부 이층 근접장 광 기록계의 설계)

  • Kim Wan-Chin;Choi Hyun;Song Taesun;Park No-Cheol;Park Young-Pil
    • 정보저장시스템학회:학술대회논문집
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    • pp.4-11
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    • 2005
  • In this paper, we propose novel optics design for media inside near-field recording (NFR) using hemispherical solid immersion lens (HMS). To obtain strong advantage of data protection and high data capacity simultaneously, HMS based near field optics using aplanatic position of super hemisphere is designed. In this design, to improve small optical tolerance of this aplanatic position, additional aspheric lens surface is added on top of the HMS and it is combined with zoom optics which composed of two single lenses having low numerical aperture (NA). Also, to compensate chromatic aberration which happens seriously in optics using blue laser diode, diffractive optical element is used. Using zoom optics, additional aspheric lens surface, and diffractive optical element together, wavefront aberration and chromatic aberration are effectively reduced in broad range of cover layer thickness and wavelength variation. In addition, In this paper, effect of gap induced aberration is investigated by analyzing different behavior of each TM and TE wave for designed media inside dual-layer NFR optics.

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