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September 18, 2003 FORTH Heraklion Crete, Greece

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Presentation on theme: "September 18, 2003 FORTH Heraklion Crete, Greece"— Presentation transcript:

1 September 18, 2003 FORTH Heraklion Crete, Greece
DALHM 2ND MEETING September 18, 2003 FORTH Heraklion Crete, Greece

2 outline to do list review photonic crystal measurements & simulations
CMM measurements & simulations conclusion & comments future work

3 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

4 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

5 Photonic Crystal Simulations

6 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).

7 Band structure calculations

8 5th Band Equal frequency contours

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18 Bilkent alumina based PC
Hexagonal lattice n = 3.1 (alumina) r/a = 0.32 ωa/2πc ~ 0.69

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22 Lateral Field component profiles at the focal plane

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24 Composite Metamaterial measurements

25 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

26 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

27 Phase Measurements in Composite Meta Materials

28 Phase dispersion for n>0 material (PCB board)

29 Phase difference as a function of thickness for n>0 material (PCB board)

30 Phase dispersion as a function of resonant element number for SRR+Wire CMM

31 Phase dispersion as a function of resonant element number for SRR+Wire CMM

32 Phase difference as a function of thickness for 1D CMM

33 1D CMM Wedge Measurements
2 by1 Wedge structure: Wedge angle θ=34o Smallest edge: 8 elements Largest edge: 19 elements

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35 θ=34o ~65 cm ~40cm

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38 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

39 Angular Transmission profile at LHS max.

40 Angular Transmission profile at several frequencies

41 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.

42 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.

43 2D CMM using two side printed PCBs


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