Transcript Lumus Ltd. - Technion – Israel Institute of Technology

Optical Noise-Free
Microphone (ONFM)
Prof. Mordechai Segev, Technion
Prof. Israel Cohen, Technion
Eng. Zvika Katz
Dr. Rami Aharoni
Ofer Pillar
.
1
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
.
2
ONFM Technology
A high-sensitivity, optical sensor for acoustic
vibrations in the body, with background isolation
Thus far focused on small standoff applications
in the mobile communication markets:
Blue-tooth head-sets, and cellular phones
As well as high performance audio headsets
.
3
Value Proposition
Consumer:
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 muting
Working from home with children playing in
background
Safe usage of a street café as an office
Improved voice recognition functions
.
4
Value Proposition
Professional:
User can speak in a noisy environment
without interference [“No boom Headset”]:
Broadcasters on streets or in noisy sport events
Heavy equipment operators
Call service centers
Aviation
Factory floor
Homeland security
Military
.
5
ONFM Concept
.
6
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
either
 Spectral augmentation – synthesizing hi-freq
components from pre-recorded sound library
 Signal fusion with standard microphone
.
7
Standard Set
Blue-tooth
Headset
Eliminates
monotonous,
intermittent and
Voice
abrupt noise
.
“Beep”
ONFM
H. Clap
8
ONFM – Prelim Demo
Hand-clapping:
fused sensor
algo. essentially
removes noise.
Further
development to
enhance
performance and
evaluate spectral
augmentation
2/4/08
Output
Input
.
9
Accomplishments
Small standoff ONFM
concept demonstrated
Demo of high-fidelity,
high-suppression of
intermittent wideband
noise
Construction of small devices
Demo loose physical contact
Potentially compact, low cost, low power
.
10
Patents
Three patent applications
Basic concept – favorable PCT search
report, national phase
Low-cost, small standoff device [IL, PCT]
High performance large standoff device [IL,
PCT]
Additional patents in preparation
Large standoff, speckle corrected device
.
11
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
.
12
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
.
13
Summary
Revolutionary opto-acoustic technology
Huge market potential
Demonstrated feasibility of concept
Technology suitable for mobile headsets
and additional products for directional
hearing aids and security applications
22/3/08
.
14
Complex Nonlinear Opto-Fluidity
Carmel Rotschild, and M. Segev
Physics Department, Technion-Israel Institute of Technology, Haifa 32000, Israel
D. N. Christodoulides
College of Optics & Photonics-CREOL, University of Central Florida
To be Submitted to Nature
Current opto-fluid technology
microchip, which can continuously
monitor sugar level of diabetes patients
Light
MicroCHIPS: micro-reservoirs
which can be loaded with medication,
implanted in the patient's body and
administering the medication in a timed manner
Opto-fluidity state of the art
D. Psaltis, S. R. Quake & C.Yang, NATURE, 442, 27 2006
Physical mechanism
Light
Optical force bend
light
Induced polarizability
Distribute Dn
Gradient force
Distribute particles
Low index
Highly transparent
Liquid
Drag transfer momentum
from particles to fluid
High index
Highly transparent
Nano-Particles
Motivation:
Use light to control mechanical properties of fluids
How?
transfer momentum from light to fluid
Absorption : Limits light propagation + thermal effect


p   Eo
Gradient
Force
  a 3n12
m 1
m2  2
2


1   j t
E r , t  
Ar e  c.c
2
 is the polarizability
n2 n p
m

n1 nb
We have found a way to induce :
strong force, and low mobility of particles,
resulting High momentum transfer to liquid
 
F  I
4

Physical processes
Electromagnetic gradient force
Force per
particle
F 

4
I
Force per
volume
FN

4
I
N: particles density
Overview: Opto-Hydrostatics
Light
Optical force
bend light
Induced
polarizability
Distribute Dn
Gradient force
Particles
Four-wave mixing in artificial Kerr Media
P.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
Optical force bend
light
Induced polarizability
Distribute Dn
Gradient force
Distribute particles
Low index
Highly transparent
Liquid
Drag transfer momentum
from particles to fluid
High index
Highly transparent
Nano-Particles
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
Advantages:
High index contrast
Small core: Low scattering
Long ligands: Low mobility (high drag)
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 structure
design for lifting
Optically induced surface tension
Low power
 cos
h
gr
h : height
 : surface
 tension
 : density
g : gravity
 : contact
 angle
High power
Low power
High power
Light / surface interaction
mm from
Threshold
distance
Suggesting chaos:
Spectrum expands in time
Future plans
•Methodological experiments on
-Optically induced surface tension (Hydrostatic)
-Optically induced Dn (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
Optically induced catalysis
A Functionalized CdSe Quantum Dot
- Carbon Nanotube Heterostructure
Stanislaus S. Wong
Optically controlled self-assembly
Optical setup
2D
3D
Spatial intensity
distribution
Self-assembly
Optically induced transparency
Polystyrene nano-suspensions
  0.532mm , f  3.5 104
Air bubbles nano-suspensions
  0.532mm , f  103
mm
losses =20%
High power
mm
Propagation distance in mm
Low power
a  50 nm, n p  1 , nb  1.33
Propagation distance in mm
losses=13%
Propagation distance in mm
Propagation distance in mm
a  50 nm, n p  1.56 , nb  1.33
losses=97%
Low power
mm
losses =20%
High power
mm
R. El-Ganainy, C. Rotschild, M. Segev, and D. N. Christodoulides, Optics Express, 15, 10207(2007)
; Ibid, Opt. Lett., 32, 3185 (2007).
Conclusions
First 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