sculpting light holography and applications and applications.pdf · holography has lots of...
TRANSCRIPT
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Sculpting Light
Holography and Applications
Dr. P.T. Ajith Kumar
President and Leading Scientist
Light Logics Holography and Optics Pvt. Ltd
June 2014
www.lightlogics.in
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Dedication
To
Dr. Yuri N. Denisyuk -
Father of White-Light Holography.
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Organization of the Presentation
• Holography
• General Applications
• Advanced Applications
• Light Logics Holography and Optics
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Optical Holography
…a method to record and
reconstruct light fields with its
whole information content.
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.
Visual Perception
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A PARADOXICAL SITUATION
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MAN’S EFFORTS TO MAP
SCENES AND OBJECTS AND
COMMUNICATE PERSPECTIVES
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PHOTOGRAPHY
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Beautiful, but not whole !
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INABILITY OF PHOTO EMULSIONS -
Records only partial information content of
a light field. A photograph is just an intensity
mapping, monochrome or color!
Where is the depth gone?
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IDEAL MATERIAL RESPONDS TO
BOTH INTENSITY AND PHASE and
recreate a virtual piece of space.
space!
… BUT STILL A DREAM !
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EARLY DREAMERS
BRAGG W.L (1939-42)
GABOR D. 1948-51)
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DENNIS GABOR (1900-79) in 1948 INVENTED
wave front recording and reconstruction, for
which he received Nobel Prize in Physics in 1971.
‘H O L O S ’ W H O L E
‘G R A M ’ I N F O R M A T I O N
‘H O L O G R A M ’ W H O L E I N F O R M A T I O N
I N T E N S I T Y
P H A S E
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What brought Nobel Prize for Gabor? Photograph of an INTRFERENCE PATTERN!
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What is an interference pattern?
PHASE ENCRYPTED INTENSITY!
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How Does
Light Scattering Micro Structures
record and recreate whole Information ?
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Light Harnessing Micro Structures
A complex grating that scatters light
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PHOTOGRAPH OF A TRASMISSION HOLOGRAM
and micro structures of holograms.
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Scattering of light by apertures modifies the input light fields and in the resulting
output is decided by the aperture.
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A Hologram is a complex grating that is unique
for a specific object and object orientation
A line grating diffracts light and the emerging beam is modified as per the micro structure of the grating. Similarly a
square grating diffracts light to form a unique diffraction pattern. A hologram can be considered as a diffraction
grating, that has a complex fringe structure unique for the object and the object orientation, that diffracts light to
reconstruct the image.
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A true hologram
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How to Produce Complex
Light Harnessing Micro Structures ?
Just through interference of light waves,
photograph the interference pattern to have a
HOLOGRAM
Recording of the interference pattern functions
as complex diffracting structures that uniquely
sculpt light.
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Holography needs to create
easy and stable Interference Pattern
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Lasers Power of simplicity and togetherness
Light Weightless and Tiny
Travels about 300,000 Km/sec
Cuts steel and diamond
Gives us a major portion of information
Entertain us and
Helps us to communicate with the universe, both
the micro and macro.
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LASERS CREATE EASY INTERFERENCE
PATTERN
O R D I N A R Y L I G H T L I G H T+ M O R E L I G H T
N O I S E
L A S E R
M U S I C
D A R K N E S S
B R I G H T N E S S
I N T E R F E R E N C E P A T T E R N
L I G H T L I G H T+
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Wavelength of visible light is about 0.5 micron and for recording stable interference pattern, the system stability
requirement is to be more than this. Vibrations and movements of sub-micron order can mix-up the maxima and
minima of the interference structure and the information stored is lost.
= 0 .5 M I C R O N = 1 / 2 0 0 0 m m
/2 = 1 / 4 0 0 0 m m
STABLE INTERFERENCE
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A BASIC HOLOGRAM
RECORDING
SCHEME
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A BEAM SPLITTER
Interference needs at least two light beams. Hence the laser beam has to be split into two parts, one to
illuminate the object and the other just to add to the scattered beam from the object, to form the interference
pattern. An ordinary glass piece or a coated glass can form a BS.
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SPATIAL FILTERING
NON FILTERED FILTERED
Beam size of a laser is usually about a millimeter and hence it is required to expand the laser beam so that the entire
object area is illuminated well. But, expansion of laser beams by using a lens leads to creation of lots of noise
fringes, due to dust and other non-uniformities. A Spatial Filter SF is used to expand and filter the laser beam.
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SPATIAL FILTERING
A SF is a combination of a tiny high power lens and a pinhole. The noise fringes can be considered as a spatial
distribution and at the back focal point of the lens the DC portion is focused and the high spatial frequency noise
surrounds it . In reality the, lens is bringing the Fourier Pattern of the light field to its back focal plane
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SPATIAL FILTER
If a pinhole of proper size is used to filter the central DC portion of the light field at the focal plane of the lens, we will
get a uniform expanded laser beam with all the spatial noise eliminated. In reality, a microscope objective (say 10X or
20X ) in conjunction with a 30 or 20 micron pinhole, arranged on a small x-y-z translation mount forms the SF.
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EXPANDED FILTERED BEAM
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BEAM DIRECTORS
We use back side coated mirrors to see our face. But, if such mirrors are used to reflect laser light, it will be
reflected from the front surface and the back inner surface. Of the mirror These reflected sets of beams interfere
each other to form Fringes of Equal Thickness, thus loosing the uniformity of the laser beam. Hence, front coated
mirrors are applied in laser optics and holography.
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A PRACTICAL
HOLOGRAPHY SET UP
Thus a practical holographic set up uses laser, BS, SFs, mirrors, lenses, vibration isolation tables, shutters for
exposure, apart from the Object and the recording medium.
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Holograms: Light harnessing
micro structures
Can be -
• Transmittance variation
• Thickness variation
• Refractive Index variation
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RECORDING MEDIUM
Different types of light sensitive media are used to record holograms. This range from high resolution
photographic emulsion to photopolymer. Depending upon the physical change taking place in the medium, it can
be classified as absorption, phase, relief hologram etc.
Light Logics Holographic
Photopolymer and DCG Plates
Silver Halide Plates / Films
DCG
Photoresist
Photopolymers
Photorefractive Glass
Photorefractive Crystals
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RECONSTRUCTED IMAGES
Photograph with a white light hologram of
Dr. Y.N. Denisyuk
Photographs of reconstructions of
a few holograms recorded at
CUSAT in 1984.
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APPLICATIONS OF
HOLOGRAPHY
CREATIVE,
SCIENTIFIC and
TECHNOLOGICAL
Holography has lots of applications ranging from road flatness testing to identification of supersonic fighter jets.
The applications can be broadly devided into Creative and Scientific.
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DISPLAY
ARCHIVING
CREATIVE
Holography is getting matured as a new arm of creative media with lots of exceptional capabilities. It has real depth,
dimensional capabilities and color as the raw material for a creative mind. The creative artist can seek the help of an
experienced heliographer to convert his ideas into a holograms. Holograms are used to archive images and
creations of eternal value. Holographic Studio and Camera Systems that sculpt light to convert ideas into images.
Color and Space,
raw materials for
creative expression.
Picture taken from the internet is acknowledged
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Portraits
.
A moment of one’s life, as frozen space time – Portraiture
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Large Perspective Images in small area –
a window to the third dimension.
Picture from Prof. Martin Richardson is gratefully acknowledged
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ADVERTISEMENT AND BRANDING
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SECURITY HOLOGRAMS
Atomic Force Microscope (AFM) image of a Light
Logics Security Hologram, depicting defined
micro relief structures and Security Master
Hologram Origination System
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COUNTERFEITING - a global menace.
Picture taken from the internet is acknowledged
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SECURITY AGAINST
COUNTERFEITING
should start with the basic assumption
that …anything manmade can be counterfeited !
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Even God made objects
are counterfeited !!!
… And it has reached
such a stage that…
Acknowledge pictures taken from the internet
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DIGITAL IMAGING AND PROCESSING
Modern digital tools see images as color or monochrome dots
and easily copy, scan, or capture…., process and print.....
Counterfeiting / forgery made easy….
The good old sanctity of photographic evidence was lost !!!
During the first half of the 80s….
Security Holography evolved as an effective
tool to fight against counterfeiting and forgery.
Acknowledge pictures taken from the internet
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Sculpting Light -
Man on Mother Nature’s Trail
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Micrograph of a peacock feather-
Diffracting structures with Specific order
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Diffracting structures with Specific order
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Diffracting structures with specific order
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MAN ON MOTHER NATURE’S TRAIL
Acknowledge picture from Prof. Graham Saxby’s bool
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SECURITY HOLOGRAM….
is generally, a hologram with a microscopic
relief structure
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Categories
2D/3D
Dot-matrix
e-beam
Photopolymer
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A 2D/3D Mastering • 2D Layers of Images are Superposed at Different
Depth to form a 3D Structure.
• Specific Colors are Assigned
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2D/3D Hologram • Security Depends lot on the Design and
the Skill of the Holographer.
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DOT-MATRIX HOLOGRAMS
• Security depends mainly on the
integrity of the origination
company.
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Image-matrix System Creates complex relief structures
Creates identical structures if repeated
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E-BEAM ORIGINATION
• Creates Very Complex Patterns with High Resolution
• Less number of Players
Acknowledge picture from Dr. Anton
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COMPLEX CONTENT IN
E-BEAM HOLOGRAM • Security depends mainly on the integrity of the
origination company.
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Why security holograms ?
A very attractive and
efficient security device
Difficult to copy by
conventional digital tools
Virtually impossible to
duplicate, even by the
originator
Image formation through
diffraction.
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Complex content of e-beam holograms
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Entry Level Feature Readers
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Opportunities
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Technology for images alive..
HoloSecureTM Card
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Technology for images alive..
HoloSecureTM Card - Charm
Fully Holographic
Fully Metallic
Tough and Highly Durable
Tamper Evident and Copy Proof
Delivers Contact and Contact less Smart Functions
High Storage Capacity
Can Hold Biometric and DNA Features
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Technology for images alive..
HoloSecureTM Card - Charm
Secure and Hybrid Data Switching
Holographic Data Storage and Recognition
Laser Engraved Variable Data
Holds Hundreds of Security Features
Hybrid Machine Readability
Multilevel Holographic Security
Possibility of Unique, Non-repeatable and
Random Holographic Features
Optical Switching
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Technology for images alive..
HoloSecureTM Card - Features
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NON-DESTRUCTIVE TESTING
AND EVALUATION
HOLOGRAPHIC DOUBLE EXPOSURE INTERFEROGRAMS
MEDICAL IMAGING
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Real-time NDT
Holographic live fringe stress
measurement of thin films, conducted by
the author, at the Cochin University of
science and Technology , in 1995. The
method has lots of applications in remote
temperature measurement and stress
measurement.
Holograms are popular across the world as an efficient security device. None of the digital imaging tools works with a
security hologram and hence the counterfeiter fails to effectively duplicate it. There are various distinctive factors
that add security value for a hologram. Light Logics produces cost effective and reliable security hologram
mastering machines, records high security master holograms, securely manufactures various types of security
holograms.
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TIME-AVERAGED Holography
HOLOGRAM OF A VIBRATING LOUD
SPEAKER RECORDED BY THE AUTHER
IN 1995
FIRST EVER RECORDED TIME-AVERAGED HOLOGRAMS OF MUSICAL
WIND INSTRUMENTS (INDIAN FLUTES) RECORDED BY THE AUTHER IN
1997
While recording the hologram, if the object is vibrating in a periodic manner, the reconstructed image will have
fringes superposed and these domains of equal amplitude vibration regions can be effectively applied for the
vibration analysis of structures. Machines and musical instruments .
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MUSICAL ACOUSTICS
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Holographic Optical Elements (HOEs)
HOEs are diffractive optical
elements with a variety of
special applications. HOEs
can be categorized as
lenses, gratings, mirrors,
filters and multiple function
elements.
Recording of a a Holographic Lens
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Hololens for Solar Light Concentration
HOEs are diffractive optical
elements with a variety of
special applications. HOEs
can be categorized as
lenses, gratings, mirrors,
filters and multiple function
elements.
Light Logics high transmittance and printout free
Hololens for Solar Concentration
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HOLOGRAPHIC GRATING
Hologratings have several
applications in imaging,
photonics systems optical
communication, integrated
optics etc. Volume Gratings
are applied in laser beam
shaping, multiplexing and de-
multiplexing of CWDM, DWDM
channels etc.
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Light Logics CUSTOM MADE HOLOGRAPHIC
Gratings
If two plane beams are allowed to interfere and form a hologram, the internal fringe structure will be a set of closely
spaced lines with a sinusoidal modulation, forming a line grating.
Hologratings have several
applications in imaging,
photonics systems optical
communication, integrated
optics etc.
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POWER SPECTRUM OF HOES
HOEs are diffractive elements
and hence wavelength
sensitive. Holographic mirrors,
lenses, gratings and
combination elements yield
power spectrum generally
similar to the refractive
counterparts. Focus of a
holographic parabolic mirror
(top), power spectrum of a
conventional grating and a
holo-grating (middle) and that
of a conventional lens and a
holo-lens (bottom), recorded
by the author in 1984.
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VOLUME Bragg gratings VBGS
VBGs are volume holograms with great diffraction efficiency
and wavelength selectivity. A great amount of research work on VBG element recorded in Corning
photorefractive glass
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All Electronic
Info Transfer
Info Storage
Info Processing
Yesterday
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Info Transfer
Info Storage
Info Processing
Opto Electronic
Today
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Info Transfer
Info Storage
Info Processing
All Optical
Tomorrow
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All Optical
Massive Storage
3D Processing
Effective Coupling I/O)
Pattern Recognition
Immense Bandwidth
No Cross talk
Large Scale Integration
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Optical Holography
As the Only Means to record
and reproduce total light
information. . .
There is a rebirth of
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Present Major Players
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Holographic DATA STORAGE
HOLOGRAPHIC VERSETILE DISK
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HOLOGRAPHIC DATA STORAGE
HOLOGRAPHIC PHOTO PLYMER DISK
The data arrays are fed to a Spatial Light
Modulator (SLM) and hologram of a
laser beam modulated with the
information is recorded . Arrays of
such tiny holograms are formed by
spatial, angular and peristrophic
multiplexing.
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Commercial level large volume
holographic data storage is getting
matured and a set of devices with
promising features are being
developed by various Companies. STX
Aprilis, In-Phase Technologies,
Optware were some of the earlier
birds into holographic data storage
device development.
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OPTICAL DATA STORAGE in
Bio-photonic Material
Bacteriorhodopsin, the purple membrane
protein found developed from the
Halobacteria, found in deep salty water is
being tried as a bio-photonic storage
medium for holography and dynamic
hologram formation.
Image of BR developed at the Indian Institute of Technology, Mumbai, shot by a Team lead by the auther in 1996, as
part of a film on Bio-molecular Electronics
Acknowledge picture from IIT - Mumbai
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Variable Data Storage for Security
Serial number 123
Data modulated signal wave
Processed reconstruction
Light Logics developed a
photopolymer data strip for variable data
storage and security. Own developed
LCSLM based data writer/ reader is used
to record and read data on a real-time
manner in the HoloMer 06A
photopolymer.
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Experimental setup
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Photopolymer Based System
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System
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Hologram Verification Screen capture
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DATA TRANSFER
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INTEGRATED OPTICS
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INFO COUPLING
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ICT Info Transfer
Info Storage
Info Processing
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Massive Storage
Processing
Effective Coupling (I/O)
Pattern Recognition
Cognitive Ability
UNIQUE BRAIN
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In synthetic holography, the fringe
structure of a hologram is calculated by
using special algorithms and sampled to
form an array of holograms, recorded one
after another. Holograms of non-existing
subjects and those with interesting visual
effects can be created through CGH. Two
CGHs created at C-DIT in 1992, by the
Team lead by the author
COMPUTER GENERATED HOLOGRAPHY-CGH
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OPTICAL INFORMATION PROCESSING
AND PATTERN RECOGNITION
In conventional electronic processors
more and more elements are squeezed
into lesser and lesser space to achieve
speed. But, this can not be continued
beyond certain limit due to electron
tunneling. Hence alternate processor
architectures are being tried. Optical
Processors with holographic elements
are being tried in lightning fast data and
image processing/pattern recognition
applications and the area is getting
matured.
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WORD RECOGNITION
Holographic matched filtering can be used for several interesting applications. The above pictures show the word
recognition system developed by the author, at the Cochin University, in 1987. Correlation peaks are obtained wherever
the word HOLOGRAPHY is recognized optically. A post processing of the power spectrum yields sensible results.
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HOLOGRAPHIC DATA SEARCH
Data pages on SLM
MULTIPLEXED
RECORDING
DATA SEARCH
PARTIAL
DATA SEARCH
EXAMPLE SEARCH OPERATION RESULT
High speed parallel search possible
Diffracted light in each beam is proportional
to the match between stored page and the
search argument
Pictures from Dr. Joby Joeph, IIT, Delhi is
gratefully acknowledged
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Search Capabilities
If 500 holograms at single location
Use SLM of 1000 frames/sec
Gives 500,000 correlations per sec. One correlation searches 1Mb of data
Search of 500,000 images per sec.
Limited by detector array processing speed
Parallel Multiple Correlations
Extremely fast search
Pictures from Dr. Joby Joeph, IIT, Delhi is gratefully acknowledged
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www.lightlogics.in 105
. . . a lot for your kind attention
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Production and R&D: Light Logics Holography and Optics
Crescent Hill, Thiruvallom, Trinvandrum, Kerala, India-695 027.
Phone : +91-471-2383484, Mobile : +91-9447383484, Fax : +91-471-2383584
email : [email protected] , [email protected]
Global Operations Centre:
Light Logics Holography and Optics
Kuttanad, Park Centre, Technopark, Trivandrum, Kerala, India-695 581.
Phone : +91-471-2527282.
To Reach Us
www.lightlogics.in