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λμ κ³΅κ° λμνμ μν 볡μ μ§ν μ΄λ―Έμ§ λ° λμ€νλ μ΄ μμ€ν
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Όλ¬Έ (λ°μ¬) -- μμΈλνκ΅ λνμ : 곡과λν μ κΈ°Β·μ 보곡νλΆ, 2021. 2. μ΄λ³νΈ.λΉμ νλμΌλ‘ μ΄ν΄νλ©΄ κ°μκ³Ό νμ μ ν¬ν¨ν λ€μν κ΄ν νμμ ν΄μ ν μ μλ€. λ―Έλ κΈ°μ μ΄λΌ λΆλ¦¬λ νλ‘κ·Έλ¨, 3μ°¨μ μ΄λ―Έμ§ λ° 3μ°¨μ λμ€νλ μ΄ μμ€ν
λ€μ νλμ 볡μμ§νμ μ΄ν΄νκ³ λ³μ‘°ν¨μΌλ‘μ¨ κ΅¬νλ μ μλ€. νμ‘΄νλ κ΄κ³΅ν μ₯μΉλ₯Ό λμ΄μλ νλ κ΄νμ κΈ°λ°ν κ΄κ³΅ν μ₯μΉλ€μ μμ©ν λ° λ°μ μν€κΈ° μν΄ λ§μ μ°κ΅¬κ° μ§νλμ΄μμ§λ§, μ§κΈκ» ꡬνλ μ₯μΉλ€μ κ³΅κ° λμν (space-bandwidth product)μ μ νμΌλ‘ μΈν΄ κ·Έ μ±λ₯μ΄ λμ€μ κΈ°λμ λΆν©νκΈ° μ΄λ €μμ κ²ͺκ³ μλ€.
λ³Έ λ
Όλ¬Έμ 볡μ μ§ν μ΄λ―Έμ§ λ° λμ€νλ μ΄ μμ€ν
μμ κ³΅κ° λμνμ ν₯μ μν€λ λ°©λ²μ μ μνλ€. 볡μ μ§ν λ³μ‘° μμ€ν
μ μ±λ₯μ κ΄ν μμ€ν
μ μ 보λμ λνλ΄λ κ³΅κ° λμνμ μν΄ μ νλλ€. μ΄ κ³΅κ° λμνμ ν₯μμν€κΈ° μνμ¬ μ μλ λ€μν λ€μ€ν κΈ°μ μ μ μ©νλ©°, λμμ λ€μ€νλ μ 보λ₯Ό λΆλ¦¬νλ μκ³ λ¦¬μ¦κ³Ό μ₯μΉλ₯Ό κ³ μνλ€. 첫λ²μ§Έλ‘ λμ§νΈ νλ‘κ·ΈλνΌ κΈ°μ μ κ³΅κ° μ£Όνμλ₯Ό λ€μ€νν΄ λμνμ ν¨μ¨μ μΌλ‘ νμ©νλ λ°©λ²μ κ³ μνμ¬ νλλ νλ‘κ·Έλ¨μ 촬μ μμμ μ¦κ°μν¨λ€. λλ²μ§Έλ‘, λ¨μΌ 촬μ νΈλ¦¬μ νμ΄μ½κ·ΈλνΌ (single-shot Fourier ptychography) κΈ°μ μμλ κ΄ μ‘°μ¬ λ€μ€νλ₯Ό μ¬μ©νμ¬ μ΄λ―Έμ§ μΌμμ κΈ°λ‘λλ μ 보μ μμ νμ₯μν¨λ€. λ€μ€ν λ μ 보λ₯Ό λΆν΄νκ³ λ³΅μ μ§νμ νλνκΈ° μνμ¬ μλ‘μ΄ κ΄ν μμ€ν
κ³Ό μ μ° μκ³ λ¦¬μ¦μ κ³ μνμ¬ ν΄μλκ° ν₯μλ 볡μ μ§νμ νλνλ€. μΈλ²μ§Έλ‘, μ μλ νλ‘κ·Έλ¨ λμ€νλ μ΄μ μ‘°λͺ
λ€μ€ν λ° μλΆν κΈ°μ μ μ μ©νλ€. λ€μ€ν λ μ 보λ μΈκ°μ μΈμ§μ μκ° λμνκ³Ό μ μλ μμ€ν
μ κ³΅κ° νν°λ§μ κ²°ν©μΌλ‘ λΆν΄λλ€. ꡬνλ νλ‘κ·Έλν½ λμ€νλ μ΄λ κ³΅κ° λμνμ΄ νμ₯λμ΄ λ λμ μμΌκ°μ μΌμ°¨μ νλ‘κ·Έλ¨μ μ 곡νλ€.
λ³Έ λ
Όλ¬Έμ μμ 곡κ°λμνμ΄λΌλ 곡ν΅λ λ¬Έμ λ₯Ό 곡μ νλ μ΄λ―Έμ§ λ° λμ€νλ μ΄ λΆμΌμ λ°μ μ κΈ°μ¬ν κ²μΌλ‘ κΈ°λλλ€. μ μλ λ³Έ μ°κ΅¬μμ μ μλ λ°©λ²μ΄ λ€μν 볡μ μ§ν λ³μ‘° μμ€ν
μ μ±λ₯ ν₯μμ μκ°μ μ£Όλ©°, λμκ° μΌμ°¨μ κ³μΈ‘, νλ‘κ·ΈλνΌ, κ°μ λ° μ¦κ°νμ€μ ν¬ν¨ν λ€μν λ―Έλ μ°μ
μ λ°μ μ κΈ°μ¬ν μ μκΈ°λ₯Ό κΈ°λνλ€.Understanding light as a wave makes it possible to interpret a variety of phenomena, including interference and diffraction. By modulating the complex amplitude of the wave, hologram, three-dimensional imaging, and three-dimensional display system, called future technologies, can be implemented that surpass the currently commercialized optical engineering devices. Although a lot of research has been conducted to develop and commercialize the wave optical system, state-of-the-art devices are still far from the performance expected by the public due to the limited space-bandwidth product (SBP).
This dissertation presents the studies on high SBP for complex amplitude imaging and display systems. The performance of a complex amplitude modulating system is limited by the SBP, which represents the amount of information in the optical system. To improve the SBP of the complex amplitude in a limited amount of information, the author applies various multiplexing techniques suitable for the implemented system. In practice, the spatial frequency multiplexed digital holography is devised by efficiently allocating frequency bandwidth with dual-wavelength light sources. The author also applies illumination multiplexing to the single-shot Fourier ptychography to expand the amount of information recorded in the image sensor. Computational reconstruction algorithm combined with novel optical design allows the acquired multiplexed information to be decomposed in the imaging system, leading to improvement of size of the image or resolution. Furthermore, the author applied illumination multiplexing and temporal multiplexing techniques to holographic displays. The multiplexed information is decomposed by a combination of human perceptual temporal bandwidth and spatial filtering. The SBP enhanced holographic display is implemented, providing a more wide viewing angle.
It is expected that this thesis will contribute to the development of the imaging and display fields, which share a common problem of small SBP. The author hopes that the proposed methods will inspire various researchers to approach the implementation of complex amplitude modulating systems, and various future industries, including 3-D inspection, holography, virtual reality, and augmented reality will be realized with high-performance.Abstract i
Contents iii
List of Tables vi
List of Figures vii
1 Introduction 1
1.1 Complex Amplitude of Wave 1
1.2 Complex Amplitude Optical System 3
1.3 Motivation and Purpose of the Dissertation 5
1.4 Scope and Organization 8
2 Space-Bandwidth Product 10
2.1 Overview of Space-Bandwidth Product 10
2.2 Space-Bandwidth Product of Complex Amplitude Imaging Systems 11
2.3 Space-Bandwidth Product of Complex Amplitude Display Systems 13
3 Double Size Complex Amplitude Imaging via Digital Holography 15
3.1 Introduction 15
3.1.1 Digital Holography 16
3.1.2 Frequency Multiplexed Digital Holography 22
3.1.3 Adaptation of Diffractive Grating for Simple Interferometer 24
3.2 Principle 26
3.2.1 Single Diffraction Grating Off-Axis Digital Holography 26
3.2.2 Double Size Implementation with Multiplexed Illumination 29
3.3 Implementation 32
3.4 Experimental Results 34
3.4.1 Resolution Assessment 34
3.4.2 Imaging Result 36
3.4.3 Quantitative 3-D Measurement 38
3.5 Conclusion 42
4 High-Resolution Complex Amplitude Imaging via Fourier Ptychographic Microscopy 43
4.1 Introduction 43
4.1.1 Phase Retrieval 45
4.1.2 Fourier Ptychographic Microscopy 47
4.2 Principle 52
4.2.1 Imaging System for Single-Shot Fourier Ptychographic Microscopy 52
4.2.2 Multiplexed Illumination 55
4.2.3 Reconstruction Algorithm 58
4.3 Implementation 60
4.3.1 Numerical Simulation 60
4.3.2 System Design 64
4.4 Results and Assessment 65
4.4.1 Resolution 65
4.4.2 Phase Retrieval of Biological Specimen 68
4.5 Discussion 71
4.6 Conclusion 73
5 Viewing Angle Enhancement for Holographic Display 74
5.1 Introduction 74
5.1.1 Complex Amplitude Representation 76
5.1.2 DMD Holographic Displays 79
5.2 Principle 81
5.2.1 Structured Illumination 81
5.2.2 TM with Array System 83
5.2.3 Time Domain Design 84
5.3 Implementation 85
5.3.1 Hardware Design 85
5.3.2 Frequency Domain Design 85
5.3.3 Aberration Correction 87
5.4 Results 88
5.5 Discussion 92
5.5.1 Speckle 92
5.5.2 Applications for Near-eye Displays 94
5.6 Conclusion 99
6 Conclusion 100
Appendix 116
Abstract (In Korean) 117Docto