scholarly journals Genetic optimization of photonic crystal waveguide termination for both on-axis and off-axis highly efficient directional emission

2009 ◽  
Vol 17 (12) ◽  
pp. 10126 ◽  
Author(s):  
Liyong Jiang ◽  
Haipeng Li ◽  
Wei Jia ◽  
Xiangyin Li ◽  
Zexiang Shen
Keyword(s):  
Photonic Crystal ◽  
Genetic Optimization ◽  
Photonic Crystal Waveguide ◽  
Highly Efficient ◽  
Directional Emission

scholarly journals Highly efficient mode converter for coupling light into wide slot photonic crystal waveguide

2014 ◽  
Vol 22 (17) ◽  
pp. 20678 ◽  
Author(s):  
Xingyu Zhang ◽  
Harish Subbaraman ◽  
Amir Hosseini ◽  
Ray T. Chen
Keyword(s):  
Photonic Crystal ◽  
Mode Converter ◽  
Photonic Crystal Waveguide ◽  
Highly Efficient

scholarly journals Time-reversal constraint limits unidirectional photon emission in slow-light photonic crystals

2016 ◽  
Vol 374 (2075) ◽  
pp. 20150263 ◽  
Author(s):  
Ben Lang ◽  
Daryl M. Beggs ◽  
Ruth Oulton
Keyword(s):  
Photonic Crystal ◽  
Time Reversal ◽  
Slow Light ◽  
Photon Emission ◽  
Light Regime ◽  
Photonic Crystal Waveguide ◽  
Photonic Crystal Waveguides ◽  
Matter Coupling ◽  
Directional Emission ◽  
Light Coupling

Photonic crystal waveguides are known to support C-points—point-like polarization singularities with local chirality. Such points can couple with dipole-like emitters to produce highly directional emission, from which spin-photon entanglers can be built. Much is made of the promise of using slow-light modes to enhance this light–matter coupling. Here we explore the transition from travelling to standing waves for two different photonic crystal waveguide designs. We find that time-reversal symmetry and the reciprocal nature of light places constraints on using C-points in the slow-light regime. We observe two distinctly different mechanisms through which this condition is satisfied in the two waveguides. In the waveguide designs, we consider a modest group velocity of v g ≈ c /10 is found to be the optimum for slow-light coupling to the C-points. This article is part of the themed issue ‘Unifying physics and technology in light of Maxwell's equations’.

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