Surface Plasmon Hybridization of Whispering Gallery Mode Microdisk Laser

Oka Kurniawan

Iftikhar Ahmed

Er Ping Li

Photonics Global

14th to 16th December 2010

Singapore

Plasmonics promises both high speed and miniaturization

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NanoPlasmonics (A*STAR-SERC)

Research on Plasmonics source is essential

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k

w

kx

21

21

rr

rrx ck

lig

ht co

ne

= c k

Previous works have shown progress though having low intensity

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Akimov, A. V., A. Mukherjee, C. L. Yu, D. E. Chang, A. S. Zibrov, P. R. Hemmer, H. Park, and M. D. Lukin. “Generation of single optical plasmons in metallic nanowires coupled to quantum dots.” Nature 450, no. 7168 (November 2007): 402-406.

KollerD.M. “Organic plasmon-emitting diode.” Nat Photon 2, no. 11 (November 2008): 684-687.

Metal-insulator-metal structure can excite surface plasmon and coupled directly to waveguide

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Walters, R. J., R. V. A. van Loon, I. Brunets, J. Schmitz, and A. Polman. “A silicon-based electrical source of surface plasmon polaritons.” Nat Mater 9, no. 1 (January 2010): 21-25.

We use microdisk laser cavity structure to obtain high intensity output

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metal

semiconductor

metal

MSMsource

MIMwaveguide

MIMcircuits

Radius = 1 µmLayer thicknesses = 120 nm

Finite-difference time domain method with realistic solid-state model and Lorentz-Drude model is used for simulation

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Multi-electron multi-level model for modeling electron dynamic in semiconductor. The model can model stimulated emission in laser.

Conventional microdisk shows whispering gallery mode

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Total electric field at the centre plane of the microdisk

Electric field peak intensity at 1.47 µm.

Attaching metal layers hybridize the whispering gallery mode with surface plasmon polariton mode

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Total electric field at middle plane of the plasmonic microdisk.

Electric field enhancement is about 20,000 times at 1.47 µm.

Comparison of whispering gallery mode and surface plasmon polariton mode.

We can couple the plasmonic source to an MIM waveguide with high efficiency

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Metal

Semiconductor

Metal

Metal

Insulator

Metal

Side view

Gap = 20 nm

We observed the surface plasmon polariton wave traveling along the waveguide and the coupling efficiency is about 60%

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Normalized electric field at the middle of the plane. The intensity at the waveguide is 60% of the microdisk.

Summary

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