Fig. 1. Diagram of experimental devices for measurement of transmission matrices
Fig. 2. Photograph of experimental devices for measurement of transmission matrices
Fig. 3. Identity matrix modulation mode. (a) Input modulation mode; images acquired when; (b) α=0; (c) α=π/2; (d) α=π
Fig. 4. Hadamard matrix modulation mode. (a) Input modulation mode; images acquired when; (b) α=0; (c) α=π/2; (d) α=π
Fig. 5. Tranmission matrices measured under identity matrix modulation mode. (a) Amplitude information; (b) phase information
Fig. 6. Tranmission matrices measured under Hadamard matrix modulation mode. (a) Amplitude information; (b) phase information
Fig. 7. Input phase of focus phase conjugate wave of transmission matrix measured under identity matrix modulation mode for different pixel coordinates. (a) (20,20); (b) (80,20); (c) (50,50); (d) (20,80); (e) (80,80)
Fig. 8. Input phase of focus phase conjugate wave of transmission matrix measured under Hadamard matrix modulation mode for different pixel coordinates. (a) (20,20); (b) (80,20); (c) (50,50); (d) (20,80); (e) (80,80)
Fig. 9. Focusing results of transmission matrices at different positions based on identity matrix modulation. (a) Speckle pattern without modulation; (b) pixel coordinate of (20,20); (c) pixel coordinate of (80,20); (d) pixel coordinate of (50,50); (e) pixel coordinate of (20,80); (f) pixel coordinate of (80,80)
Fig. 10. Focusing results of transmission matrices at different positions based on Hadamard matrix modulation. (a) Speckle pattern without modulation; (b) pixel coordinate of (20,20); (c) pixel coordinate of (80,20); (d) pixel coordinate of (50,50); (e) pixel coordinate of (20,80); (f) pixel coordinate of (80,80)
Pixel coordinate | Identity matrix mode | Hadamard matrix | |
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Background intensity /arb.units | | Focusintensity /arb.units | Ratio of focusintensity to background intensity | Background intensity /arb.units | Focusintensity /arb.units | Ratio of focusintensity to background intensity |
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(20,20) | 1050 | 16044 | 15 | 1213 | 19866 | 16 | (20,80) | 1032 | 23316 | 23 | 1147 | 10774 | 9 | (50,50) | 1038 | 25223 | 24 | 1174 | 14470 | 12 | (80,20) | 1037 | 18187 | 18 | 1117 | 36513 | 33 | (80,80) | 1003 | 16609 | 17 | 1269 | 14522 | 11 | | Enhancement ratio | 19 | Enhancement ratio | 16 |
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Table 1. Focusing performance of scattering media