Pupil-plane filtering for improved signal detection in an optical data-storage system incorporating a solid immersion lens

Milster, Tom D.; Shimura, Kei; Jo, Joshua S.; Hirota, Kusato

doi:10.1364/ol.24.000605

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…In contrast, two maximum regions along the x direction show i x Ͼi A . Milster et al 15 used a pupil-plane filtering to block the negative distribution to improve signal contrast.…”

Section: Resultsmentioning

confidence: 99%

Polarization analyses of readout signals by a solid immersion lens in phase change recording material

2001

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Comprehensive analyses based on the rigorous vector diffraction theory were used to simulate the polarized readout signals using a solid immersion lens (SIL) in reading phase change (PC) disks. For an x-polarized incident beam, the signal contrast in x and y polarization was a different function of air gap between the bottom surface of the SIL and recording medium. Compared with conventional nonpolarized detection schemes for PC media, the x-polarized contrast is a factor 1.0 to 1.35 higher at different air gaps, at a small cost of total intensity loss. . He has worked in the field of optical storage for over ten years, and his main interests now are the technologies of optical data storage and flat-panel display.

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“…In contrast, two maximum regions along the x direction show i x Ͼi A . Milster et al 15 used a pupil-plane filtering to block the negative distribution to improve signal contrast.…”

Section: Resultsmentioning

confidence: 99%

Polarization analyses of readout signals by a solid immersion lens in phase change recording material

2001

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“…2D irradiance distribution at the exit pupil plane is calculated by summing the squares of the x, y, and z components of the electric field. 11,12) A 4-f (focal length) imaging system introduced in the previous paper 6,7) is used again in order to investigate the effect of the exit pupil plane filtering without disturbing the optical path from the light source to the recording medium. The specific optical filter is located on the image plane of the original pupil.…”

Section: Modulation Of Signal Contrast Corresponding To the Media Ind...mentioning

confidence: 99%

“…Reversed signal levels can be improved by using special filter positioned at exit pupil plane on condition that particular recording media and X-polarized light. 6,7) However, circular polarized light is preferred rather than Xpolarized light considering actual manufacture.…”

Section: Introductionmentioning

confidence: 99%

Pupil Plane Characteristics and Filtering for Optical Data Storage Using Circular Polarization with a Solid Immersion Lens

Yeo

Kim

Choi

et al. 2009

jjap

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Solid immersion lens (SIL) system is an excellent candidate for future technology to increase the data density of optical data storage. In a SIL system, properties of reflected light seen at the exit pupil strictly depend on the air gap thickness between the SIL and the top surface of the medium. Moreover, signal level and contrast reflected from the data bit is directly related to the modulation of Án=n 0 . In this case, the signal contrast can be improved by using an appropriate filter. However, unlike the incident beam of a linear polarized light, circular polarized light requires deeper understanding of the pupil plane characteristics corresponding to the vectorial nature of light.

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“…Many efforts have been made to increase the air-gap while keeping the signal contrast and the storage density at an acceptable level. Milster et al [2] showed that the signal contrast can be improved by placing a pupil filter in front of the SIL. Hirota et al [3] filled the air-gap with a liquid lubricant to increase the total internal refraction angel at the lower interface of the SIL.…”

Section: Introductionmentioning

confidence: 99%

Near-field optical storage system using a solid immersion lens with a left-handed material slab

Liu¹,

He²

2004

Opt. Express

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A new near-field optical storage system utilizing a left-handed material (LHM) is introduced by attaching an LHM slab to the lower surface of a conventional solid immersion lens (SIL). The performance of the present storage system is compared with a conventional SIL system through numerical simulation. The LHM slab in the present storage system can image very well the focused spot at the lower surface of the SIL to the surface of a disc. It allows a large air-gap for the mechanical convenience while keeping a large signal contrast and a high storage density. The tolerance of the air-gap is also improved.

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Pupil-plane filtering for improved signal detection in an optical data-storage system incorporating a solid immersion lens

Cited by 14 publications

References 2 publications

Polarization analyses of readout signals by a solid immersion lens in phase change recording material

Polarization analyses of readout signals by a solid immersion lens in phase change recording material

Pupil Plane Characteristics and Filtering for Optical Data Storage Using Circular Polarization with a Solid Immersion Lens

Near-field optical storage system using a solid immersion lens with a left-handed material slab

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