硅光子学中的光源问题
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硅光子学中的光源问题. 冉广照 [email protected] 北京大学物理学院 介 观物理国家重点实验室 2012.07. 04. Outline. Surface Plasmons Electrical Surface Plasmon Plasmon Laser. SPASER.

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硅光子学中的光源问题

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硅光子学中的光源问题

冉广照

[email protected]

北京大学物理学院

介观物理国家重点实验室

2012.07. 04


Outline

Outline

  • Surface Plasmons

  • Electrical Surface Plasmon

  • Plasmon Laser


Spaser

SPASER

  • 1. D. J. Bergman and M. I. Stockman, Surface Plasmon Amplification by Stimulated Emission of Radiation: Quantum Generation of Coherent Surface Plasmonsin Nanosystems, Phys. Rev. Lett. 90, 027402-1-4 (2003).

  • 2. M. I. Stockman, Spasers Explained, Nat. Phot. 2, 327-329 (2008) .

  • 3. M. I. Stockman, Spaser as Nanoscale Quantum Generator and Ultrafast Amplifier, Journal of Optics 12, 024004-1-13 (2010)


What is spaser

What is SPASER

  • A spaser is a metal nanosystem that supports SP eigenmodes, surrounded by an active medium of the population-inverted two-level emitters.

  • A spaser is the nanoplasmonic counterpart of a laser

    3. A SPASER is a nanoscopic quantum generator of coherent and intense local optical fields

    .


Sp modes

SP modes

Quality factor, Q.

Dark mode


Comparisons

Comparisons

@ 630 nm wavelength


Potential applications of the spaser and nanolasers

Potential Applications of the Spaser and Nanolasers


Spaser principle

SPASER Principle

A SPASER consists of:

1

2

3

The ultimately smallest

quantum nano-generator

nature photonics 2,327 (2008)


Lasing condition

Lasing condition


Quantum theory of spaser

Quantum theory of SPASER

  • The system Hamiltonian of SPP

creation and annihilation operators

Perturbation

Interaction Hamiltonian

Kinetic equation for the population number of SP in an n-th mode is

Journal of Optics, 12, 024004-1-13 (2010).


Lasing condition1

Lasing condition

Dipole transition matrix element

Spectrum width

Nano metal particle size

Calculated gain for three monolayers of quantum dots

Normalized Optical gain


Gan spaser

GaNSPASER

JSTQE. 14, ( 2008) 1395


Gan spaser1

GaNSPASER

SPP modal gains are calculated separately for both

(a) symmetric and

(b) asymmetric SPP modes as a function of hωwith a fixed carrier density,n= 1 × 1019 cm−3 .

It is clear that Fermi–Dirac factor at finite temperature reduces the peak gain and gain bandwidth with increasing temperatures. Considering a silver film of thickness d = 30 nm, nSPand modal factors Φ as well as polarization factors μ are accounted in these calculations: nsSP= 7.0, naSP= 3.45, Φs= 0.19, Φa= 0.3, μs= 0.47, and μa= 0.33

JSTQE. 14, ( 2008) 1395


Demonstration of a spaser based nanolaser

Demonstration of a spaser-based nanolaser

Normalized extinction (1),

excitation (2),

spontaneous emission (3),

and stimulated emission (4)

spectra of Au/silica/dye nanoparticles.


Plasmon lasers at deep subwavelength scale cgd

Plasmon lasers at deep subwavelengthscale CGD

NATURE 461,629(2009)


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SPP supporting structures (Waveguides)

IM

IMI

MIM

CGD (Conductor-Gap-Dielectric)


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Electrical SPP Amplification M-S


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Electrical SPP Amplification M-S

Nano Lett. 2012, 12, 2459


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SPP field for IMI structure

Local electric fields for 10 nm silver layer in vacuum at 2.2 eV frequency

Ex

Ex


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SPP Laser IMI

NATURE PHOTONICS 4 , 382 JUNE 2010


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SPP Laser IMI


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  • SPP field for MIM structure

J. SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 16, 295 (2010),

” Phys. Rev. B 73, 035407 (2006)

解析解


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SPP Laser MIM

22 June 2009 / Vol. 17, No. 13 / OPTICS EXPRESS 11108


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SPP Laser MIM

  • 3 um x d~130nm ( ± 20nm), @180 μA at 78K. Inset: emission spectra for 20 (green), 40 (blue) and 60 (red) μA.

  • (b) Lasing mode light output @ 78K.

  • Actual near field pattern for 6 micron (d =130nm) device for below threshold 30 μA, and

  • above threshold 320 μA.

  • Poynting vector z.

  • 6 umX d~310nm at 298K, pulsed


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SPP Laser MIM

103 nm

@10 K 200 uA

nature photonics 1, 589 (2007)


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???


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PHYSICAL REVIEW B 80, 153304 (2009)


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  • SPP Laser CGD

p

sp

(Note)


Plasmon lasers at deep subwavelength scale cgd1

Plasmon lasers at deep subwavelengthscale CGD

NATURE 461,629(2009)


Lasing

Lasing

NATURE 461,629(2009)

Such idea originated a few years ago


Rt sub diffraction limited plasmon laser by total internal reflection

RT sub-diffraction-limitedplasmon laser by total internal reflection


Rt sub diffraction limited plasmon laser by total internal reflection1

RT sub-diffraction-limitedplasmon laser by total internal reflection

a, The spontaneous emission spectrum @1,960MWcm-2 showing obvious cavity modes despite being below the threshold.

b, Room-temperature laser spectra and integrated light-pump response (inset) (1,960MWcm-2, black) through amplified spontaneous emission (2,300MWcm-2, red) to full laser oscillation (3,074MWcm-2, blue).


Future integrated plasmonic circuit

Future integrated plasmonic circuit

(0) incoupling structures; (1) color demultiplexing in a “Z” add/drop filter; (2) bends and tapers in LR-SPP waveguides; (3) all-optical preprocessing logic; (4) integrated photodetection; (5) optical clock incoupled from free space; (6) nano-optical subcircuit (on-chip integrated light source, electroopticplasmostor, single quantum dot devices, integrated photodetection); (7) collection of light via “photon sorting”;(8) integrated plasmonic color filtering; and (9) beam shaping of emitted light. JSTQE. 16( 2010) 295

SPP source


Summary

Summary

  • Surface Plasmons

  • Electrical Surface Plasmon

  • Plasmon Laser

Silicon- Plasmonics ?


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谢谢!


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