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Proposal for Being a KAGRA Member

Proposal for Being a KAGRA Member. July 30, 2012 Kyuman Cho Department of Physics, Sogang Universit y. OVERVIEW. Introduction Sogang University Photonics Lab Recent Researches on Interferometry Research Plan. I. Introduction. Seoul. City Hall. Sogang U. Han River.

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Proposal for Being a KAGRA Member

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  1. Proposal for Being a KAGRA Member July 30, 2012 Kyuman Cho Department of Physics, Sogang University

  2. OVERVIEW • Introduction • Sogang University • Photonics Lab • Recent Researches on Interferometry • Research Plan

  3. I. Introduction

  4. Seoul City Hall Sogang U. Han River

  5. Yonsei Univ. EwhaWomans Univ. Shinchon (新村) Area Sogang Univ. Hongik Univ.

  6. History Established in 1960 by American Jesuits Faculty: 402 Full-time, tenure-track faculty members Students Undergraduate: 8,000 Graduate: 4,000 Over 1,000 international students Many courses taught in English Ranked #1 in National Customer Satisfaction Index survey in 1998, 1999, 2003, 2004, 2006 Ranked #1 in Korean Standards-Service Quality Index survey in 2007, 2009, 2010 Overview

  7. School of Humanities School of Social Sciences School of Natural Sciences Mathematics Physics Chemistry Life Science School of Engineering School of Economics School of Business Administration School of Communication Academic Program

  8. College of Natural Sciences

  9. Department of Physics • 17 Professors • Particle Physics • Condensed Matter Physics • Optics • BK21 Project • World Class University Project • Center for Quantum SpaceTime • Center for Quantum Chaos Applications • http://physics.sogang.ac.kr

  10. Researches in Photonics Lab • 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 Measurements of Optical Parameters Transmission Line Fiber & FSO Sensors Modulation (Phase, Frequency Amplitude, Intensity) Demodulation (Phase, Frequency Amplitude, Intensity) Linear and Non-Linear Optics Physical, Chemical, Biological Phenomena Optical Communications Data, Information Contents, etc. Data Recovery • FSO communications for subscriber service (fixed &moving) • Visiblelight communications

  11. Members and Collaborators • Current Members • Post Doctoral Fellow: Dr. Youngkyu Park • Ph.D. Students: • Seung Hyun Yoon • SeangHorEang • Joonkyu Park • Undergraduate Intern: Yongjae Kim • International Collaborators • Prof. Christopher C. Davis, University of Maryland, USA • Prof. Anatoly Zayatts, Kings College, UK • Dr. Igor Smolyaninov, BAE System, USA • Domestic Collaborators from • Universities: Korea Univ., Postech, Yonsei Univ., Ewha Univ., etc. • Research Institutions: ETRI, KIST, KETI, etc. • Industries: POSCO, GSI, NanoStorage, KAC, etc.

  12. Recent Researches on Interferometry

  13. Research Subjects • One 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 interferometer • biosensors, • 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.

  14. Optical I/Q-Demodulator PBS1 HWP BS or PBS QWP HWP • Can measure amplitude and phase change of the probe beam simultaneously • No need for feedback control to maintain optimum sensitivity PBS2

  15. Application Example • Scanning Interferometer for complex surface diagnostics

  16. RF I/Q-Demodulator

  17. Application Example • Scanning Interferometer for complex surface diagnostics

  18. Application Example • Phase and amplitude images of a patterned surface

  19. Application Example • Wide 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.

  20. Application Example • Scanning results (step height 3 μm)

  21. Application Example • New arrangement using double pass in AOM

  22. Application Example • Vibration Measurement  The equivalent minimum displacement ~ 5 x 10-13 m

  23. Application Example • Scanning microscopy The topography (a), amplitude (b), and color-scaled amplitude (c)

  24. Application Example • Readout sensor for a fluidic channel In Out

  25. Application Example Dual mode laser Dual mode laser I Q BS : Beam splitter PBS : Polarization Beam Splitter POL : Polarizer M : Mirror HWP : Half Wave Plate QWP : Quarter Wave Plate PD : Photo Diode PZT : Piezoelectric Transducer OI : Optical isolator OL : Objective Lense OL OL Sample Constant-Phase Scanning Heterodyne Interferometer K. H. Kwon, B. S. Kim, and K. Cho, OPTICS EXPRESS, 16, 13456 (2008)

  26. Application Example • Scanning Results (a), (c) : constant-phase scheme, (b), (d): conventional scheme • 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.

  27. Proposed Scheme for Measuring MILB Magnet M2 PBS FR(F) FR(-F) Laser PD1 OI Pol CP QWP M1 DA PD2 A A Current Source • 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.

  28. Application Example • Proposed scheme for measuring MIB

  29. Research Plan

  30. Advanced Lab for GWD • Will 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 GWD • Create 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 researchnetwork with KAGRA members • Arrange regular meetings. (Ex: Prof.ShinijiMiyoki’s visit) • Exchange knowledge, ideas, and members.

  31. Suggested KAGRA Collaboration Members • Prof. Christopher C. Davis, Dept. of ECE, Univ. of MD. • Mentor of the Photonics Lab. • Tens of years of experiences on interferometry, sensors, and optical communications • Collaborator for designing interferometric measurement scheme for MIB. • Dr. Youngkyu Park, Dept. of Phys., Sogang University • Ph.D. Students in Dept. of Phys., Sogang Univ. • SeungHyun Yoon • SeangHorEang • Joonkyu Park

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