MODEL
Construct the breast phantom and define the anatomical tissue regions.
OPTICAL METAMATERIALS · BACHELOR THESIS · ICEEE 2026TUNABLE MULTI-FREQUENCY
TUNABLE MULTI-FREQUENCY
OPTICAL METAMATERIAL
ABSORBER.
A geometrically scalable double split ring resonator absorber engineered for predictable multi-frequency optical absorption through controlled resonator scaling.
423 THz518 THz640 THz831 THzFDTD · CST≈100% ABSORPTION
DSRR
423 → 831 THz4DESIGNED RESONANCES
423–831THz TUNING RANGE
≈100%PEAK ABSORPTION
3LAYER ABSORBER
01
THE RESEARCH IDEA
Control the optical response through geometry.
The proposed absorber uses a DSRR printed above a dielectric spacer and continuous silver ground plane. The ground suppresses transmission, while the split-ring geometry produces LC resonances and confines electromagnetic energy. Instead of rebuilding the topology for every operating point, the resonator dimensions are systematically scaled to tune the response.
The study reports designed resonances at 423, 518, 640 and 831 THz, with absorption approaching unity at the target resonances.
02
INTERACTIVE DSRR LAB
Scale the resonator. Move the resonance.
Select one of the four designs to see the actual dimensions reported in the thesis. The live model rescales the concentric DSRR geometry and animates incident optical energy toward the absorber.
423 THz DESIGNW 288 nm · r₁ 128 nm · r₂ 80 nm · w₁ 16 nm · g₁/s/t 32 nm
INTERACTIVE OPTICAL LAB423 THzFDTD · NORMAL INCIDENCE
ABSORBER STACK
SiO₂60 nm spacer
Ag GROUND40 nm reflector
LIVE GEOMETRYr₁ 128 · r₂ 80 nmg₁ / s / t = 32 nm
MOVE CURSOR · CLICK THE RESONATOR
OPTICAL FIELD ACTIVESILVER DSRR / SiO₂ / SILVER GROUNDSELECT FREQUENCY TO MORPH GEOMETRY
03
GEOMETRICAL SCALING
The dimensions behind four optical bands.
The spacer and ground thicknesses remain fixed while the lateral DSRR geometry is scaled. The 831 THz case keeps W at 288 nm while using the smaller ring dimensions reported for the high-frequency design.
| Parameter | 423 THz | 518 THz | 640 THz | 831 THz |
|---|---|---|---|---|
| W (nm) | 288 | 230.4 | 180 | 288 |
| r₁ (nm) | 128 | 102.4 | 80 | 80 |
| r₂ (nm) | 80 | 64 | 50 | 50 |
| w₁ (nm) | 16 | 12.8 | 10 | 10 |
| g₁ (nm) | 32 | 25.6 | 20 | 20 |
| s (nm) | 32 | 25.6 | 20 | 20 |
| t (nm) | 32 | 25.6 | 20 | 20 |
| ts (nm) | 60 | 60 | 60 | 60 |
| tg (nm) | 40 | 40 | 40 | 40 |
04
S-PARAMETERS + ABSORPTIVITY
Four targets. Four strong absorption responses.
With the metallic ground plane making transmission approximately zero, absorptivity is evaluated from the reflection response. The simulated curves show deep S11 minima at the designed resonances and absorption approaching 100%.
05
SURFACE CURRENT
Seeing the resonance mechanism.
Current concentration around the split rings confirms the resonant behavior. The lower-frequency design also supports higher-order modes produced by the ring structure and coupling between the inner and outer resonators.
06
ICEEE 2026 · ANTALYA, TURKEY
The thesis went from GUC to an international conference.
The work was formally invited for in-person presentation at the 13th International Conference on Electrical and Electronics Engineering (ICEEE 2026), held in Antalya, Turkey, April 27–29, 2026. The certificate records the delivery of the presentation under paper ID B4194.
07
OFFICIAL DOCUMENTS
Invitation. Presentation. Certificate.
The invitation names the research work and invites its in-person presentation in Antalya. The certificate confirms attendance and delivery of the presentation.
FROM NANOMETER GEOMETRY
TO INTERNATIONAL PRESENTATION.
A bachelor thesis spanning resonator design, CST/FDTD simulation, S-parameter analysis, surface-current interpretation and conference presentation.
