The document discusses the interaction of gold nanostructures with various laser polarizations using Comsol simulation and experimental methods. It highlights the concepts of plasmonics, surface plasmon resonance, and their implications for enhanced electric fields and photothermoelectric effects. The authors aim to advance their research at Rice University in applied physics.

1. NAKATANI RIES 2018
１
K. Shiratori,1,* M. Abbasi,2 C. Evans,3 and D. Natelson2,3
1 Dept. of Phys. Sci., Ritsumeikan Univ.
2 Dept. of Elec. and Comp. Eng., Rice Univ.
3 Dept. of Phys. and Astro., Rice Univ.
The interaction of gold nanostructures with
different laser polarizations in COMSOL simulation

2. Contents
2
Plasmonics : Study and Application of Plasmons
Objective
Approaches : Experimental and Simulation
Results & Discussion
Impressions
Next Steps

3. 3
Introduction
LASER
LASER
Free electrons behave as a fluid.
these electrons oscillate collectively, causing ripples like water.
Surface Plasmon Resonance (SPR)
A resonance between plasmons and the electric field
Plasmons
the collective oscillation
Surface Plasmon Polariton (SPP)
plasmons and the electric field

4. 4
Introduction
Fig. 1. : A localized surface plasmon[1]
localized surface plasmon resonance (LSPR) can
cause large enhancements in the electric field[1].
Surface-enhanced Raman spectroscopy (SERS)
and other techniques to measure the dynamics
of a single molecule [2].
[1] K. Willets et al., Annu. Rev. Phys. Chem., 58:267-297(2007) [2] C. Evans et al., J. Nano Lett. , 17. 5646-5652(2017)
green red
𝐸 = 𝐸𝑜
𝐸 = 𝑔(𝜔)𝐸𝑜 𝐸 = 𝑔 𝜔 𝑔(𝜔′
)𝐸𝑜
𝐼𝑆𝐸𝑅𝑆 ∝𝑔4𝐼𝑜

5. 5
To simulate the thermoelectric detection of
SPP in gold nanostructures
Objective

6. 6
Experiment side
Method
Fig. 2. Schematic of experiment[4]
785nm
Optical
Chopper
[4] P. Zolotavin et al., J. Nanoscale, 9. 9160-9166(2017)
Measured the photothermoelectric
effect of gold nanostructures.

7. 7
Experiment side
Method
Fig. 3. Photothermoelectric (PTE) map under
(a) 0° and (b) 90° laser polarization.
a b
E
E

8. Simulation side
Method
3D modeling of the sample
with smooth edges
A cross-platform finite element analysis,
solver and multiphysics simulation software
SiO2
Gold
Perfectly Matched Layer (PML)
Mesh
Plane Wave
8

9. 9
Total field
Polarization along x-axis Polarization along z-axis
Results & Discussion
a1 b1
E
E
Fig. 4. Simulation results: Total field of the device under 0° polarization a1 and under 90° polarization b1

10. 10
Energy absorption
Polarization along x-axis Polarization along z-axis
Results & Discussion
a2 b2
E
E
Fig. 5. Simulation results: Energy absorption of the device under 0° polarization a2 and under 90° polarization b2

11. 11
The U.S. is huge, adventurous and interesting!!
Impressions

12. 12
Next Steps
✔️ Apply for Rice University, Applied Physics