Proposal for Being a KAGRA Member
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Transcript of Proposal for Being a KAGRA Member
Proposal for Being a KAGRA Member
July 30, 2012
Kyuman ChoDepartment of Physics, Sogang University
OVERVIEWI. Introduction
− Sogang University − Photonics Lab
II. Recent Researches on Interferometry
III. Research Plan
I. Introduction
City HallSogang U.
Seoul
Han River
Yonsei Univ.
Ewha Womans Univ.
Sogang Univ.Hongik Univ.
Shinchon ( 新村 ) Area
OverviewHistory
Established in 1960 by American Jesuits
Faculty: 402 Full-time, tenure-track faculty membersStudents
Undergraduate: 8,000Graduate: 4,000
Over 1,000 international studentsMany courses taught in EnglishRanked #1 in National Customer Satisfaction Index survey in 1998, 1999, 2003, 2004, 2006Ranked #1 in Korean Standards-Service Quality Index sur-vey in 2007, 2009, 2010
Academic ProgramSchool of Humanities
School of Social Sciences
School of Natural SciencesMathematics
Physics
Chemistry
Life Science
School of Engineering
School of Economics
School of Business Administration
School of Communication
College of Natural Sci-ences
Department of Physics17 Professors
Particle PhysicsCondensed Matter PhysicsOptics
BK21 ProjectWorld Class University ProjectCenter for Quantum SpaceTimeCenter for Quantum Chaos Applicationshttp://physics.sogang.ac.kr
Researches in Photonics Lab
Modulation(Phase, Frequency
Amplitude, Intensity)
Demodulation(Phase, Frequency
Amplitude, Intensity)
Physical, Chemical,Biological Phenomena
Linear andNon-Linear
Optics
Sensors
Interferometry High-resolution scanning optical microscope High sensitivity readout sensors for biochips and micro-fluidic channels Measurement of magnetic birefringence in vacuum Precision sensor for measuring displacement, current, magnetic field, etc.
BES for plasma diagnostics NSOM, etc
FSO communications for subscriber service (fixed & moving) Visible light communications
Data, InformationContents, etc.
Data RecoveryOptical
Communications
Measurementsof Optical
Parameters
Transmission LineFiber & FSO
Members and CollaboratorsCurrent Members
Post Doctoral Fellow: Dr. Youngkyu Park Ph.D. Students:
− Seung Hyun Yoon− Seang Hor Eang− Joonkyu Park
Undergraduate Intern: Yongjae Kim
International CollaboratorsProf. Christopher C. Davis, University of Maryland, USAProf. Anatoly Zayatts, Kings College, UKDr. Igor Smolyaninov, BAE System, USA
Domestic Collaborators fromUniversities: Korea Univ., Postech, Yonsei Univ., Ewha Univ., etc. Research Institutions: ETRI, KIST, KETI, etc.Industries: POSCO, GSI, NanoStorage, KAC, etc.
Recent Researches on Interferometry
Research SubjectsOne of the pioneers in the homodyne and heterodyne I/Q-interferometer: The 1st version of the homodyne and heterodyne I/Q-interferometer was developed in 1994 and 1995, respectively.Have been designing and optimizing homodyne and heterodyne I/Q-interferometers for various applications:
Scanning interferometerbiosensors,vibrometer, and the other high sensitivity and wide dynamic range measurements in both academic and industrial applications
Have been working on feasibility study for measuring magnetically induced birefringence in vacuum:
A balanced homodyne scheme was proposed in 1991.Improved version of the MIBD was submitted to NSF and KRF in 2010 and 2012, respectively. Still looking for a proper funding.
Optical I/Q-Demodulator
PBS1
PBS2
BS or PBS
( )Si tSE e
( )LOi tLOE e
HWP
HWPQWP
Can measure amplitude and phase change of the probe beam simultaneously
No need for feedback control to maintain optimum sensitivity
Application ExampleScanning Interferometer for complex surface diagnostics
RF I/Q-Demodulator
Application ExampleScanning Interferometer for complex surface diagnostics
Application ExamplePhase and amplitude images of a patterned surface
Application ExampleWide measurement range interferometer
An astigmatic position sensing scheme is integrated to the heterodyne I/Q-interferometer.
The interference signal is used for high resolution measurement while the astigmatic sensor is used for wide range measurement.
Application ExampleScanning results (step height 3 μm)
Application ExampleNew arrangement using double pass in AOM
The equivalent minimum displacement ~ 5 x 10-13 m
Application ExampleVibration Measurement
The topography (a), amplitude (b), and color-scaled amplitude (c)
Application ExampleScanning microscopy
In
Out
Application ExampleReadout sensor for a fluidic channel
Sample
I QDual mode
laser
OL
K. H. Kwon, B. S. Kim, and K. Cho, OPTICS EXPRESS, 16, 13456 (2008)
Dual mode laser
OL
Constant-Phase Scanning Heterodyne Interferometer
BS : Beam splitterPBS : Polarization Beam SplitterPOL : PolarizerM : MirrorHWP : Half Wave PlateQWP : Quarter Wave PlatePD : Photo DiodePZT : Piezoelectric TransducerOI : Optical isolatorOL : Objective Lense
Application Example
The proposed microscope can measure both amplitude and phase simultaneously. The reflectivity image of the constant-phase scanning microscope is more clear
than that of the HIQI.
(a), (c) : constant-phase scheme, (b), (d): conventional scheme
Application ExampleScanning Results
Proposed Scheme for Measuring MILB
LaserQWP
PBS
M1
M2
Magnet
OI Pol
PD1
PD2
DA
B
Two Faraday rotators are used to rotate the modulation principal axes.
This scheme can provide the same modulation effects as rotating the magnet.
The modulation frequency can go up to tens of Hz which is high enough to minimize 1/f-noise.
No possible artifacts can be expected at the measurement frequency.
Current Source
CP
FR(F) FR(-F)
AA
Application ExampleProposed scheme for measuring MIB
Research Plan
Advanced Lab for GWDWill do our best to get a proper research grant
A big grant proposal has been submitted.Keep looking for grant opportunities if it is not awarded.
Will concentrate on the researches on GWD.Perform extensive researches on GWDCreate new ideas for improving the sensitivity of the GWD
Establish a lab for building a prototype interferometer.Gaining experiences on the large scale interferometer.Testing new ideas for the GWD
Establish active research network with KAGRA membersArrange regular meetings. (Ex: Prof. Shiniji Miyoki’s visit)Exchange knowledge, ideas, and members.
Suggested KAGRA Collaboration MembersProf. Christopher C. Davis, Dept. of ECE, Univ. of MD.
Mentor of the Photonics Lab.Tens of years of experiences on interferometry, sensors, and optical communicationsCollaborator for designing interferometric measurement scheme for MIB.
Dr. Youngkyu Park, Dept. of Phys., Sogang University
Ph.D. Students in Dept. of Phys., Sogang Univ.Seung Hyun YoonSeang Hor EangJoonkyu Park