1. DALHM Project and Bilkent University
DALHM Project Director Meeting-2
FORTH, Crete
September 17, 2003
Ekmel Ozbay
Department of Physics, Bilkent University
Bilkent, Ankara, TURKEY

2. Bilkent DALHM Team Kaan Guven (Post-doc) Mutlu Gokkavas (Post-doc)
Irfan Bulu (3rd year graduate student)
Koray Aydin (2nd year graduate student)
Sena Akarca (2nd year graduate student)
Humeyra Caglayan (1st year graduate student)
Murat Gure (Laboratory Engineer)
Past members
Ertugrul Cubukcu: has joined Harvard in August 2003
Mehmet Bayindir (now post-doc in MIT)

3. ? ? What have we done in the past ~6 months?
2D Photonic Crystals with negative refractive properties
100 GHz Double Negative Structure Fabrication and testing (Mutlu)
2D Double Negative Metamaterials
First defect structure trials
2D Photonic Crystals with negative refractive properties (Kaan)
Phase measurements and wedge structure 15 GHz Double Negative Structures (Kaan)
What we plan to do for the next 6 months and beyond? ? ?

4. Negative refraction, superlensing and subwavelength resolution in 2D photonic crystals

5. Ertugrul Cubukcu, Koray Aydin, Ekmel Ozbay, S
Ertugrul Cubukcu, Koray Aydin, Ekmel Ozbay, S. Foteinopolou, and Costas Soukoulis, “Negative Refraction by Photonic Crystals,” Nature, vol. 423, 604 (2003).

6. Ertugrul Cubukcu, Koray Aydin, Ekmel Ozbay, S
Ertugrul Cubukcu, Koray Aydin, Ekmel Ozbay, S. Foteinopolou, and Costas Soukoulis, “Subwavelength resolution in a two-dimensional photonic crystal based superlens ,” just accepted to PRL (notice received yesterday)

7. What happens when we have positive refractive index ?
Photonic crystal parameters
Dielectric rods: ε=9.61, r=1.575 mm
Crystal structure: Cubic; Period=4.794mm
9x41 layer slab structure, propagation along ΓM direction (9 layers along the propagation direction)

8. Field distribution for negative and positive refractive index behavior, respectively
ω= GHz
ω=12.00 GHz

9. Comparison of the lateral spatial field distribution of two point sources at the transmission plane for positive (blue) and negative (orange) pc. Sources are located 0.7 mm away from the photonic crystal surface and are separated by a (~λ/3)

10. 100 GHz Double Negative Structure Fabrication and testing

11. Fabrication pictures-1

12. Fabrication pictures-2

13. Fabrication pictures-3

14. 100 GHz Measurement set-up
We originally planned to use 8510C for making the 100 GHz (W-band) measurements
Delay due to the missing IF interconnect cable (which was delivered 1 week ago)
However, 8510C could not control both sources (software problems?)
We ended up measuring each frequency point one by one, and getting data by hand, each taking ~2 minutes.
In the future, we will use a computer program to acquire the data (if Agilent can’t solve our problem)

19. 100 GHz CMM measurements (preliminary, will be repeated again)
Transmission (dB)
Frequency (GHz)

20. Wires
Transmission (dB)
Frequency (GHz)

21. SRRs
Transmission (dB)
Frequency (GHz)

22. Transmission ~102 GHz ?? (too early to conclude, we need more measurements)
CMM
SRR
Wire
Transmission (dB)
Frequency (GHz)

23. 2D CMM Structure measurements

26. 2D CMM using two side printed PCBs

27. 1D CMM components of 2D CMM

28. Comparison of 2D CMM transmission to 1D CMM transmission

29. Comparison of 2D CMM transmission to perpendicular placed 1D CMM transmission

30. Negative refraction measurement (preliminary)
Monopole antenna

31. Lateral transmission amplitude profile

32. CMM defect structure measurements

33. Defect structures
Periodic arrangement of SRRs with a single layer defect
Periodic arrangement of dashed wires with a single layer defect

34. Defect measurements of SRRs
Side View of SRR Structure N N
Defect Layers E x k B

35. Defect measurements of SRRs
Side View of SRR Structure N N
Defect Layers E x k B

36. Defect measurements of Wires
Side View of Wire Structure N N
Defect Layers E x B k

37. To Do List 100 GHz CMM measurements 2D CMM structures
Computer Control
Remeasure the samples
New samples?
Simulation help from Crete ??
2D CMM structures
More measurements
Negative refraction with a smaller slab structure
Defect structures
New defect configurations
SRR based defects?
100 GHz 2D PC with negative refraction
Extend the Nature-PRL type measurements to mm-wave

38. ? ? What have we done in the past ~6 months?
2D Photonic Crystals with negative refractive properties
100 GHz Double Negative Structure Fabrication and testing (Mutlu)
2D Double Negative Metamaterials
First defect structure trials
2D PC with negative refraction (Crete Structure) simulations and extensions (Kaan)
1D CMM phase measurements and wedge structure (Kaan)
What we plan to do for the next 6 months and beyond? ? ?