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Optical Noise-Free

Microphone (ONFM)

Prof. Mordechai Segev, TechnionProf. Israel Cohen, Technion

.

Eng. Zvika KatzDr. Rami Aharoni

Ofer Pillar

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Overview Optical microphone that filters out background noise

Small standoff implementation: mobile communication

headsets professional applications

Large standoff implementation: directional hearing aids non-contact medical monitoring

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ONFM TechnologyA high-sensitivity, optical sensor for acoustic vibrations in the body, with background isolation

Blue-tooth head-sets, and cellular phones

As well as high performance audio headsets

Thus far focused on small standoff applications in the mobile communication markets:

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Value PropositionConsumer:Speaking over mobile/ VoIP w/o background interference, and w/o disclosing location:Be heard clearly in a noisy environment

(outdoor, in a car, on the shop floor)Conference calls that do not require mutingWorking from home with children playing in

backgroundSafe usage of a street café as an officeImproved voice recognition functions

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Professional:User can speak in a noisy environment without interference [“No boom Headset”]:Broadcasters on streets or in noisy sport eventsHeavy equipment operatorsCall service centersAviationFactory floorHomeland securityMilitary

Value Proposition

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ONFM Concept

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ONFM – Performance The optical sensor provides high background

suppression (potentially >70dB, demonstrated

>50dB) Achieves high sensitivity (<<1nm); detects

voice at different locations on head Complement high-frequency components by

eitherSpectral augmentation – synthesizing hi-freq

components from pre-recorded sound librarySignal fusion with standard microphone

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Blue-tooth Headset

Eliminates monotonous, intermittent and abrupt noise

Voice “Beep” H. Clap

Standard Set

ONFM

2/4/08 . 9

ONFM – Prelim DemoHand-clapping:

fused sensor algo. essentially removes noise.

Further development to enhance performance and evaluate spectral augmentation

Input

Output

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Accomplishments

Small standoff ONFM concept demonstrated

Demo of high-fidelity, high-suppression of intermittent widebandnoise

Construction of small devicesDemo loose physical contactPotentially compact, low cost, low power

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Patents

Three patent applicationsBasic concept – favorable PCT search

report, national phaseLow-cost, small standoff device [IL, PCT]High performance large standoff device [IL,

PCT]

Additional patents in preparationLarge standoff, speckle corrected device

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Potential Markets

High end Mobile phones Headsets: mobile (or land line)

phones (Bluetooth), VoIP, Gaming Professional microphones: News

Reporters, Sport commentary Professional noise canceling

headsets, Call centers, aviation, factory floor

Video Conferencing

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Other Potential Markets– large standoff

Directional hearing aids (allows hearing-aid users to discriminate between the voice of the person speaking to them and background conversations in a crowd)

Distant mics for Security camera’s

22/3/08 . 14

Summary

Revolutionary opto-acoustic technology Huge market potentialDemonstrated feasibility of conceptTechnology suitable for mobile headsets

and additional products for directional hearing aids and security applications

Complex Nonlinear Opto-Fluidity

To be Submitted to Nature

Carmel Rotschild, and M. Segev Physics Department, Technion-Israel Institute of Technology, Haifa 32000, Israel

D. N. ChristodoulidesCollege of Optics & Photonics-CREOL, University of Central Florida

MicroCHIPS: micro-reservoirs which can be loaded with medication,implanted in the patient's body and administering the medication in a timed manner

Light

microchip, which can continuouslymonitor sugar level of diabetes patients

Current opto-fluid technology

D. Psaltis, S. R. Quake & C.Yang, NATURE, 442, 27 2006

Opto-fluidity state of the art

Physical mechanism

Light

High indexHighly transparent

Nano-Particles

Low index Highly transparent

Liquid

Induced polarizability

Gradient force

Drag transfer momentum from particles to fluid

Distribute particles

Distribute n

Optical force bend light

Gradient Force

b

p

n

n

n

nm

1

2

oEp

2

12

221

3

m

mna

is the polarizabilityIF

4

ccerAtrE tj .2

1,

We have found a way to induce :strong force, and low mobility of particles,resulting High momentum transfer to liquid

Motivation: Use light to control mechanical properties of fluids

How? transfer momentum from light to fluid

Absorption : Limits light propagation + thermal effect

Physical processes Electromagnetic gradient force

INF 4

Force per volume

N: particles density

Force per particle

IF 4

Overview: Opto-HydrostaticsLight

Particles

Induced polarizability

Gradient forceDistribute n

Optical force bend light

Four-wave mixing in artificial Kerr MediaP.W. Smith, A.Ashkin, and W.J. Tomlinson, Opt. Lett. , 6, 284 (1981)

Self focusing in artificial Kerr media A.Ashkin, J.M. Dziedzic, and P.W. Smith, Opt. Lett. , 7, 276 (1982)

Physical mechanism

Light

High indexHighly transparent

Nano-Particles

Low index Highly transparent

Liquid

Induced polarizability

Gradient force

Drag transfer momentum from particles to fluid

Distribute particles

Distribute n

Optical force bend light

We have found a way to induce :

strong optical force, and large drag of

particles,

resulting efficient momentum transfer to

liquid

Quantum dots with ligands = “nano – medusa” structure

High index contrastSmall core: Low scatteringLong ligands: Low mobility (high drag)

Advantages:

Transfer angular momentum from the light to the liquid and back

Archimedes Pump: pulling liquid by light

Pipette diameter:0.7 mm

Archimedes Pump: Lifting liquid by light

Intensity structuredesign for lifting

Optically induced surface tension Low power Low powerHigh power High power

angle

contact

gravityg

density

tension

surface

heighth

grh

:

:

:

:

:

cos

Light / surface interaction

Suggesting chaos:Spectrum expands in time

m fromThresholddistance

Future plans

•Methodological experiments on-Optically induced surface tension (Hydrostatic)-Optically induced n (Hydrostatics)-Material optimization

•Theoretical model•Optically induced self assembly •Optical control over local chemical reactions•Turbulence / Laminar transient coupled•Optically induced transparency

to nonlinear optics

A Functionalized CdSe Quantum Dot - Carbon Nanotube Heterostructure

Stanislaus S. Wong

Optically induced catalysis

Optical setup Spatial intensitydistribution Self-assembly

2D

3D

Optically controlled self-assembly

Optically induced transparency

33.1,56.1,50

105.3,532.0 4

bp nnnma

fm

33.1,1,50

10,532.0 3

bp nnnma

fmPolystyrene nano-suspensions Air bubbles nano-suspensions

m

Pro

pag

atio

n d

ista

nce

in m

m

losses =20%

High power

m

losses=13%

Pro

pag

atio

n d

ista

nce

in m

m

Low power

m

Pro

pag

atio

n d

ista

nce

in m

m

losses =20%

High power

m

losses=97%

Pro

pag

atio

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ista

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in m

m

Low power

R. El-Ganainy, C. Rotschild, M. Segev, and D. N. Christodoulides, Optics Express, 15, 10207(2007)

; Ibid, Opt. Lett., 32, 3185 (2007).

ConclusionsFirst observation of symbiotic nonlinear dynamics

of fluids and light acting together: complex nonlinear Opto-fluidity.

Challenges:•Theoretical model•Sub-wavelength features•Optically induced self assembly •Optical control over local chemical reactions•Turbulence / Laminar transient coupled

to nonlinear optics

Thank you