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September 18, 2003 FORTH Heraklion Crete, Greece
DALHM 2ND MEETING September 18, 2003 FORTH Heraklion Crete, Greece
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outline to do list review photonic crystal measurements & simulations
CMM measurements & simulations conclusion & comments future work
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Photonic Crystals Simulation of photonic crystal based superlensing
Photonic crystal based superlensing experiment Simulation of negative refraction through a photonic crystal Simulation of the point source radiation through a photonic crystal with neff>0
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Composite Metamaterials
Phase measurements of 1D CMMs Negative refraction using 1D CMM wedge structure Zeff =1 measurement using 1D CMM Single SRR resonance measurement Construction of 2D CMM Transmission measurements of 2D CMM Negative refraction using 2D CMM Investigating defect and antenna applications
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Photonic Crystal Simulations
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Crete PC structure Photonic crystal with all angle negative refraction1: Hexagonal lattice n = 3.6 r/a = 0.35 ωa/2πc = 0.58 1S. Foteinopoulou, E. N. Economou, and C. M. Soukoulis, Phys. Rev. Lett. 90, (2003).
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Band structure calculations
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5th Band Equal frequency contours
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Bilkent alumina based PC
Hexagonal lattice n = 3.1 (alumina) r/a = 0.32 ωa/2πc ~ 0.69
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Lateral Field component profiles at the focal plane
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Composite Metamaterial measurements
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Left-Handed Materials
L=8.65 mm w=0.35mm r=0.9 mm Parameters: ax=8.8 mm ay=8.8mm az=6.5 mm Nx=15 Ny=15 y z x Dashed wire structure
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Left-Handed Materials
w t d r1 r2 SRR Parameters: r1=2.5 mm, r2=3.6 mm, d=w=0.2 mm t=0.9 mm Parameters: ax=8.8 mm ay=8.8mm az=6.5 mm Nx=15 Ny=15
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Phase Measurements in Composite Meta Materials
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Phase dispersion for n>0 material (PCB board)
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Phase difference as a function of thickness for n>0 material (PCB board)
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Phase dispersion as a function of resonant element number for SRR+Wire CMM
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Phase dispersion as a function of resonant element number for SRR+Wire CMM
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Phase difference as a function of thickness for 1D CMM
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1D CMM Wedge Measurements
2 by1 Wedge structure: Wedge angle θ=34o Smallest edge: 8 elements Largest edge: 19 elements
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θ=34o ~65 cm ~40cm
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Angular spectrum analysis
Maximum at LHS: Tmax= dB, ω= GHz, θ=-26o Maximum at RHS at this frequency: Tmax= dB, ω= GHz, θ=69o Overall max Tmax= dB, ω= GHz, θ=54o
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Angular Transmission profile at LHS max.
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Angular Transmission profile at several frequencies
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Conclusions Negative refraction confirmed in FORTH group’s photonic crystal Point focusing demonstrated in FORTH group’s photonic crystal. A photonic crystal with experimentally accessible parameters is proposed for superlensing, and simulated numerically. Detailed phase measurements performed on CMMs indicate that the phase advance might be negative. Refraction through a 1D wedge CMM is performed. No clear indication of negative refraction is observed yet.
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Ongoing/Future Work Negative refraction and point focusing experiments using the proposed photonic crystal structure. Repeating phase analysis on several structures Refraction experiment using 2D CMM structure. …
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2D CMM using two side printed PCBs
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