GRATING CLASSIFICATION
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1 GRATING CLASSIFICATION
2 SURFACE-RELIEF GRATING TYPES
3 GRATING CLASSIFICATION Transmission or Reflection Classification based on Regime
4 DIFFRACTION BY GRATINGS Acousto-Optics Diffractive Optics Integrated Optics Holography Optical Computing Optical Signal Processing Spectroscopy
5 GRATING APPLICATIONS Acoustic-Wave Generation Antireflection Surfaces Beam Coding, Coupling, Detection, etc. Grating Lenses Grating Scanners Head-Up Displays Holographic Optical Elements Interferometry Instrumentation Mode Conversion Multiplexing / Demultiplexing Modulation / Switching Optical Interconnections Photonic Crystal Devices Spectral Analysis
6 GRATING APPLICATIONS IN INTEGRATED OPTICS From Optical Integrated Circuits, Nishihara, Haruna, and Suhara, McGraw-Hill 1989
7 FLOQUET CONDITION
8 Grating Equation
9 METHODS OF ANALYSIS OF GRATINGS Integral Methods Finite Elements Boundary Elements Differential Methods Exact Methods - Rigorous Coupled Wave Analysis (RCWA) - Modal Analysis Approximate Methods - Two-Wave Coupled-Wave Analysis (Kogelnik s) - Raman-Nath Analysis - Others
10 Differential Grating Diffraction Analysis Hierarchy Rigorous Coupled-Wave Analysis Exact Differential Formulations (no approximations to the model) Rigorous Modal Analysis i = 0,1 only Neglect Second Derivatives (neglect some boundary effects) i = 0,1 only Two-Wave Second-Order Coupled-Wave Analysis Multi-Wave Coupled-Wave Analysis Two-Wave Modal Analysis Neglect Second Derivatives (neglect some boundary effects) i = 0,1 only Small Modulation Λ >> λ Neglect Dephasing Kogelnik Two-Wave Coupled-Wave Analysis Optical Path Method Raman-Nath Analysis Incidence Along Fringes Amplitude Transmittance Analysis Small Modulation
11 HOLOGRAPHIC GRATING DIFFRACTION GEOMETRY Region 2 Region 3 d D Region 1 k inc α θ -z y ψ φ K x 0-th k inc Region 1 Region 2 Region 3 θ i-th x n 1 n 3 K φ θ 1i.... d Λ θ 3i 0-th z i-th
12 Electromagnetic Problem Formulation Maxwell Equations Constitutive Relations Medium Properties: Permittivity, Conductivity Tensors are Periodic Electromagnetic Boundary Conditions: Continuity of Tangential Electric and Magnetic Field Components
13 Input Region (Region I) Electromagnetic Field Expansions Rigorous Coupled Wave Analysis (RCWA) Region 1 Region 2 Region 3 0-th k inc θ i-th x n 1 n 3 K θ 1i φ.... d Λ θ 3i 0-th z i-th Output Region (Region III)
14 Electromagnetic Field Expansions Rigorous Coupled Wave Analysis (RCWA) Grating Region (Region II) Complex Permittivity Tensor Expansions (Region II)
15 Rigorous Coupled Wave Analysis (RCWA) Numerical Implementation Truncation to Arbitrary Number of Diffraction Orders: M =2m+1 Grating Region Equations Standard Eigenvector/Eigenvalue Analysis Boundary Conditions: Input and Output Regions Boundaries
16 Rigorous Coupled Wave Analysis (RCWA) Numerical Implementation Number of Unknowns = 10M R ii T (Region I) 3M (Region III) 3M C ~ (Region III) 4M Number of Equations = 10M Boundary Conditions (Regions I-II and II-III) k k 1 i Ri = 3 i Ti = 0 0 Region I Plane Waves Region III Plane Waves 4M+4M = 8M M M
17 Rigorous Coupled Wave Analysis (RCWA) Numerical Implementation System of Linear Equations (10M x 10M) Size of Linear System can be Reduced
18 Rigorous Coupled Wave Analysis (RCWA) Diffraction Efficiencies Efficiencies of Backward-Diffracted Waves Efficiencies of Forward-Diffracted Waves For Lossless Gratings
19 Rigorous Coupled Wave Analysis (RCWA) Generalizations Generalized Media (in terms of constitutive equations) Multiple Cascaded Gratings Surface-Relief Gratings Varying Modulation Gratings Multiplexed Gratings Biaxial Input and/or Output Regions
20 Rigorous Coupled Wave Analysis (RCWA) Diffractive Optical Interconnect
21 Rigorous Coupled Wave Analysis (RCWA) Diffractive Optical Interconnect
22 Rigorous Coupled Wave Analysis (RCWA) Diffractive Optical Interconnect
23 Rigorous Coupled Wave Analysis (RCWA) Diffractive Optical Interconnect
24 Rigorous Coupled Wave Analysis (RCWA) Diffractive Optical Interconnect
25 Rigorous Coupled Wave Analysis (RCWA) Surface-Relief Grating
26 Rigorous Coupled Wave Analysis (RCWA) Surface-Relief Grating
27 Rigorous Coupled Wave Analysis (RCWA) Holographic Grating Scanner Example 3D-Diffraction Problem (Conical Diffraction) DIFFRACTIVE PRINTER SCANNER Linear Scan Uniform Intensity Image Plane Motion Incident Laser Beam Diffracted Laser Beam Direction of Rotation Focusing Lens Motor Disk Diffraction Grating
28 Conical Diffraction for Low- and High-Spatial Frequency Gratings
29 Rigorous Coupled Wave Analysis (RCWA) Holographic Grating Scanner Example 3D-Diffraction Problem (Conical Diffraction) Glass Substrate (n=1.5) Angle of Incidence (γ) = 35deg Freespace Wavelength = 1μm Grating Period = 0.87μm Filling Factor = 0.50 Groove Depth = 1.5μm
30 Glass Substrate (n=1.531) Angle of Incidence (γ) = 33 deg Freespace Wavelength = 1.047μm Photoresist Grating Photoresist Thickness = 2.4μm Grating Period = 0.96μm Filling Factor = 0.50 Groove Depth = 1.45μm Rigorous Coupled Wave Analysis (RCWA) Holographic Grating Scanner Example 3D-Diffraction Problem (Conical Diffraction)
31 HOLOGRAPHIC HEAD-UP DISPLAYS
32
33 Optical Interconnect Architectures
34 OPTOELECTRONICS PACKAGING WAVELENGTH DIVISION DEMULTIPLEXING Integrated photodetector Rec r / up Circuit Rec r / up Circuit Rec r / up Circuit λ 1 λ 2 λ 3 Waveguide cladding Waveguide SOP Substrate Grating coupler Thin film EE laser or fiber λ 1 λ 2 λ 3 Waveguide cladding SOP Substrate Waveguide Grating coupler
35 Holographic Grating Coupler θ f z x f z f t w t g L x Λ= 2 π K K z φ K x K
36 INTERFEROMETRIC GRATING FABRICATION FACILITY Collimating Lens Spatial Filter Shutter Laser M 1 Beam 1 Sample Beam 2 M 2
37 KOGELNIK s TWO-WAVE COUPLED-WAVE THEORY (Transmission Grating Case) θ x ε ε 0, ε 1 0 ε 0 k inc K φ.... Ι ΙΙ ΙΙΙ d R S z
38 Angular Sensitivity of Thick Gratings
39 Angular Sensitivity of Thick Gratings Case Parameters (Transmission Grating) λ 0 = 1.06μm, n 0 = , n 1 = , Λ = μm, φ =90
40 Angular Sensitivity of Thick Gratings Case Parameters (Reflection Grating) λ 0 = 1.06μm, n 0 = , n 1 = , Λ = μm, φ = 150
41 Angular Sensitivity of Thick Gratings
42 Interdigitated Electrodes Electro-optic Grating
43 Interdigitated Electrodes Electro-optic Grating D-Field Lines
44 Rigorous Coupled Wave Analysis (RCWA) Antireflecting Surface-Relief Grating Example Rectangular-Groove Grating
45 Rigorous Coupled Wave Analysis (RCWA) Antireflecting Surface-Relief Grating Example Rectangular-Groove Grating Fabrication Process
46 Rigorous Coupled Wave Analysis (RCWA) Antireflecting Surface-Relief Grating Example Electron-Microscope Picture of Fabricated Grating
47 Rigorous Coupled Wave Analysis (RCWA) Antireflecting Surface-Relief Grating Example Spectral Response of Grating
48 Rigorous Coupled Wave Analysis (RCWA) Antireflecting Surface-Relief Grating Example Spectral Response of Grating
49 Rigorous Coupled Wave Analysis (RCWA) Antireflecting Surface-Relief Grating Example Spectral Response of Grating
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