All-optical logic gates and a half-adder based on lithium niobate photonic crystal micro-cavities

Chenghao Lu; Bing Zhu; Chuanyi Zhu; Licheng Ge; Yian Liu; Yuping Chen; Xianfeng Chen

doi:doi:10.3788/COL201917.072301

Chinese Optics Letters, 2019, 17 (7): 072301, Published Online: Jul. 9, 2019

All-optical logic gates and a half-adder based on lithium niobate photonic crystal micro-cavities Download： 2686次

Chenghao Lu Bing Zhu Chuanyi Zhu Licheng Ge Yian Liu Yuping Chen ^*Xianfeng Chen

Author Affiliations

State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

Figures & Tables

Fig. 1. (a) Band diagrams in a square lattice PhC with LN (MgO-doped) rods for TE and TM modes. (b) The left is the schematic structure of the W1 waveguide in the $Γ$ -M direction; the right is the FDTD simulation result of the W1 waveguide and the sketch of the light beam coherent interference.

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Fig. 2. T-shape W1 waveguides (a) without or (b) with the L2 cavity in an LN PhC and the FDTD simulated different transmission results.

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Fig. 3. Three all optical logic gates (a) AND, (b) XOR, and (c) NOT in an LN PhC with different micro-cavities locations.

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Fig. 4. FDTD simulated transmission of (a) AND and (b) XOR gates in an LN PhC.

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Fig. 5. (a) Schematic structure of the all-optical half-adder in an LN PhC. (b) The FDTD simulated transmission of the all-optical half-adder.

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Table1. Truth Table for the AND, XOR, and NOT Logic Gates

Input A	Input B	AND	XOR	NOT
0	0	0	0	\
0	1	0	1	1
1	0	0	1	\
1	1	1	0	0

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Table2. Truth Table for the All-optical Half-adder

Input A	Input B	Output C (Carry Digit)	Output S (Sum Digit)
0	0	0	0
0	1	0	1
1	0	0	1
1	1	1	0

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Chenghao Lu, Bing Zhu, Chuanyi Zhu, Licheng Ge, Yian Liu, Yuping Chen, Xianfeng Chen. All-optical logic gates and a half-adder based on lithium niobate photonic crystal micro-cavities[J]. Chinese Optics Letters, 2019, 17(7): 072301.

All-optical logic gates and a half-adder based on lithium niobate photonic crystal micro-cavities Download： 2686次

Fig. 1. (a) Band diagrams in a square lattice PhC with LN (MgO-doped) rods for TE and TM modes. (b) The left is the schematic structure of the W1 waveguide in the $Γ$ -M direction; the right is the FDTD simulation result of the W1 waveguide and the sketch of the light beam coherent interference.

Fig. 2. T-shape W1 waveguides (a) without or (b) with the L2 cavity in an LN PhC and the FDTD simulated different transmission results.

Fig. 3. Three all optical logic gates (a) AND, (b) XOR, and (c) NOT in an LN PhC with different micro-cavities locations.

Fig. 4. FDTD simulated transmission of (a) AND and (b) XOR gates in an LN PhC.

Fig. 5. (a) Schematic structure of the all-optical half-adder in an LN PhC. (b) The FDTD simulated transmission of the all-optical half-adder.

Table1. Truth Table for the AND, XOR, and NOT Logic Gates

Table2. Truth Table for the All-optical Half-adder

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All-optical logic gates and a half-adder based on lithium niobate photonic crystal micro-cavities Download： 2686次

Fig. 1. (a) Band diagrams in a square lattice PhC with LN (MgO-doped) rods for TE and TM modes. (b) The left is the schematic structure of the W1 waveguide in the Γ-M direction; the right is the FDTD simulation result of the W1 waveguide and the sketch of the light beam coherent interference.

Fig. 2. T-shape W1 waveguides (a) without or (b) with the L2 cavity in an LN PhC and the FDTD simulated different transmission results.

Fig. 3. Three all optical logic gates (a) AND, (b) XOR, and (c) NOT in an LN PhC with different micro-cavities locations.

Fig. 4. FDTD simulated transmission of (a) AND and (b) XOR gates in an LN PhC.

Fig. 5. (a) Schematic structure of the all-optical half-adder in an LN PhC. (b) The FDTD simulated transmission of the all-optical half-adder.

Table1. Truth Table for the AND, XOR, and NOT Logic Gates

Table2. Truth Table for the All-optical Half-adder

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Fig. 1. (a) Band diagrams in a square lattice PhC with LN (MgO-doped) rods for TE and TM modes. (b) The left is the schematic structure of the W1 waveguide in the $Γ$ -M direction; the right is the FDTD simulation result of the W1 waveguide and the sketch of the light beam coherent interference.