Holographic Approach to Record and Retrieve Subwavelength-Size Objects   Using Optical Near-Field

Kim, Kyoung-Youm; Lee, Byoungho

doi:10.1143/jjap.40.1835

Cited by 4 publications

(5 citation statements)

References 9 publications

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“…14 We note that similar anisotropy also appears in the near-field holography. 7,8 We also note that in the collection mode, the order of retrieved optical power was much smaller (10 -2~1 0 -3 ) than that of the transmission mode. Therefore, the noise contribution affected the overall quality of the read images quite significantly.…”

Section: Experiments and Resultsmentioning

confidence: 77%

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Single-beam recording and retrieving of sub-wavelength-size optical information in a photorefractive crystal using near-field scanning optical microscopy

2002

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We suggest a way of photorefractive recording of sub-wavelength size optical information using the refractive index change induced by the single beam from the tapered fiber tip of the near-field scanning optical microscopy (NSOM). Data are recorded by the pure (without any change in the topography of the surface) refractive index change induced near the surface of photorefractive crystal by the light intensity distribution from the subwavelength-size fiber tip in NSOM. The size of index variation can be smaller than the size of wavelength since the distance between the tapered tip of NSOM and the crystal is about 10 nm. This can modify the transmission and collection characteristics of the light from the NSOM through the photorefractive crystal. Therefore, the characteristics of the reading beam depend on whether we previously exposed (recorded) the light from the tapered fiber tip or not and thus, the change in transmission or collection characteristics can be regarded as the on/off (binary) data.

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Section: Experiments and Resultsmentioning

confidence: 77%

“…A kind of holographic storage using NSOM was also developed very lately. [6][7][8] It is a very good candidate for the next-generation high-density optical memory since it has the capability of multiplexed recording. 8 However, the system becomes somewhat complicated since it uses two coherent object and reference beams.…”

Section: Introductionmentioning

confidence: 99%

Single-beam recording and retrieving of sub-wavelength-size optical information in a photorefractive crystal using near-field scanning optical microscopy

2002

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“…Very recently, present authors have proposed a new method for recording and retrieving a nearfield hologram, solving the above problems. 7,9 It is shown schematically in Fig. 1.…”

Section: Near-field Hologrammentioning

confidence: 99%

“…Up to date, only a possibility of near-field holographic recording of single spot has been investigated. [5][6][7] Here, we study the feasibility of the multiplexed near-field holograms using the angular multiplexing as an example. We rotated not the crystal but the direction of reference beam (using rotating mirror shown in Fig.…”

Section: Angular Multiplexingmentioning

confidence: 99%

“…However, near-field recording with a holographic method, near-field hologram, was developed very lately. [5][6][7] Up to date, most near-field recording methods use only very small part of the recording medium (on and within a few hundreds of nanometers from the surface). In this case, one way to increase the storage capacity is to use a holographic multiplexed recording method.…”

Section: Introductionmentioning

confidence: 99%

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Recording and retrieving of multiplexed near-field holograms

et al. 2002

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We present experimental results on the recording and retrieving multiplexed near-field holograms using near-field scanning optical microscopy (NSOM) and a conventional rectangular-parallelepiped or cubic photorefractive crystal. We use the fiber tip of NSOM both as an object and as a probe for scanning (reading) the images. The recording distance between the tapered tip of NSOM and the crystal (i.e. between the object and the recording medium) is a crucial factor determining the size of the stored spot and the angular selectivity since it is dependent on that distance whether the near-field components of the object wave can reach the crystal or not. Experiments on angular multiplexing show that the angular selectivity was about 0.01 degree and the retrieved spot size was smaller than the Rayleigh limit when the recording distance is about 10 nm. In addition, experiments show that near-fields originated from sub-diffraction-limit-size objects could be stored in a photorefractive crystal at 2 mm apart from the crystal surface resulting in the retrieval of sub-diffraction-limit-size spots which means that our scheme can provide a way of multilayer (stack-wise) near-field storage and, thus, contribute to the significant enhancement of the storage capacity of the near-field optical memory.

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Photorefractive recording of subwavelength-size binary data using near-field scanning optical microscopy

2002

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Holographic Approach to Record and Retrieve Subwavelength-Size Objects Using Optical Near-Field

Cited by 4 publications

References 9 publications

Single-beam recording and retrieving of sub-wavelength-size optical information in a photorefractive crystal using near-field scanning optical microscopy

Single-beam recording and retrieving of sub-wavelength-size optical information in a photorefractive crystal using near-field scanning optical microscopy

Recording and retrieving of multiplexed near-field holograms

Photorefractive recording of subwavelength-size binary data using near-field scanning optical microscopy

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