Technical Seminar

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE TECHNICAL SEMINAR PRESENTATION BY PRIYABRATA HARICHANDAN CS200210202

UNDER THE GUIDANCE OF Mr. RANJIT KUMAR BEHERA

Priyabrata Harichandan

[1]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE What is Holography? •

Holography(from the Greek, Όλος-holos whole + γραφή-graphe writing) is the science of producing holograms that allows images to be recorded in 3-Dimensions

•

Holography is a two-step imaging technique, that allows for the complete reconstruction of a wave front.

•

The hologram contains both the amplitude and phase information of the object wave, despite the fact that optical media respond to intensity variations.

Priyabrata Harichandan

[2]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE History •The holographic method was invented by D. Gabor in 1948 as a two-step lens less imaging technique to enhance the resolution of electron microscopy, for which he received the 1971 Nobel Prize in physics. • The field was revolutionized in the early 1960s by some major breakthroughs: The proposition (A. L. Schawlow and C. H. Townes) and demonstration (T. H. Maiman) of the laser principle, and the invention of volume holography (Y. N. Denisyuk).

Priyabrata Harichandan

[3]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Difference Between Photography & Holography

Photography is a point-to-point recording of the intensity of light rays that make up an image but the phase of the light is lost from the original scene. In holography, both the amplitude and the phase of the light (usually at one particular wavelength) are recorded. When reconstructed, the resulting light field which emanated from the original scene, gives a perfect three-dimensional image.

Priyabrata Harichandan

[4]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Holographic recording process

Priyabrata Harichandan

[5]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Holographic Reconstruction Process

Priyabrata Harichandan

[6]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Holographic Data Storage • Holographic data storage is a technique that can store information at high density inside crystals or photopolymers. • Unlike conventional technologies which record data bit by bit, holography allows a million bits of data to be written and read out in single flashes of light, enabling data transfer rates as high as a billion bits per second. • This holds promise for systems with high data density (Tb/cc), and fast transfer rates (Gb/sec).

Priyabrata Harichandan

[7]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Mechanism for recording Data

Priyabrata Harichandan

[8]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Mechanism for reading Data

Priyabrata Harichandan

[9]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Challenges • The complexity of holographic multiplexing strategies, and perhaps most importantly, the absence of recording materials are the challenges of holographic data storage. • The CMOS active pixel detector arrays emerging in digital photography exhibit the rapid access and data transfer properties required for holography. • Bell Labs invented a multiplexing geometry that yielded a simple, easily-implement able architecture for holographic storage systems.

Priyabrata Harichandan

[10]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE New Multiplexing Methods • In the past, multiplexing methods have required large optical systems and moving optical parts. • Now a method known as correlation multiplexing is developed where an optically complex reference beam, created by a fixed set of optics, encodes the position of the hologram in the recording medium. • Large numbers of holograms can therefore be multiplexed in essentially the same volume of the recording medium.

Priyabrata Harichandan

[11]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE New Photopolymer Recording Media To meet the needs of high-density holographic data storage, researchers at Bell Laboratories have designed a new type photopolymer, which yields high response, high photosensitivity media in millimeter-thick, optically flat formats.

Priyabrata Harichandan

Photopolymer

[12]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Recent Developments • InPhase commercializes Holographic Data Storage • Optware makes bold move to standardize Holographic Versatile Disk. • First public demonstration of world's first Holographic Drive prototype on April 14, 2005. • Cypress gains design win in holographic storage.

Priyabrata Harichandan

[13]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE Conclusion •With the exponential growth in the Computational speed and the need to store large amount of data, the HDS technology comes as a boon to the digital industry. • IBM's five-year old holographic data storage system (HDSS) program is advancing toward the compact storage of BILLIONS of bytes of rapidly-accessible information. • Holographic storage makes data storing & retrieval faster , making it a potentially valuable technology in areas of aviation, computing, image processing and telecommunications.

Priyabrata Harichandan

[14]

National Institute of Science & Technology

TECHNICAL SEMINAR HOLOGRAPHIC DATA STORAGE

Priyabrata Harichandan

[15]