Indirect transitions of a signal interacting with a moving refractive index front

Michel Castellanos Munoz; Alexander Yu Petrov; Liam O'Faolain; Juntao Li; Thomas F. Krauss; Manfred Eich

doi:10.1117/12.2063078

Indirect transitions of a signal interacting with a moving refractive index front

Michel Castellanos Munoz^*, Alexander Yu Petrov, Liam O'Faolain, Juntao Li, Thomas F. Krauss, Manfred Eich

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects can be potentially realized with a refractive index modulation as small as 0.001.

For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect transition and not by a direct transition without wave vector variation.

Original language	English
Title of host publication	Active Photonic Materials VI
Editors	GS Subramania, S Foteinopoulou
Place of Publication	Bellingham
Publisher	SPIE
Number of pages	6
Volume	9162
DOIs	https://doi.org/10.1117/12.2063078
Publication status	Published - 2014
Event	Conference on Active Photonic Materials VI - San Diego, United States Duration: 17 Aug 2014 → 21 Aug 2014

Publication series

Name	Proceedings of SPIE
Publisher	SPIE-The International Society for Optical Engineering
Volume	9162
ISSN (Print)	0277-786X

Conference

Conference	Conference on Active Photonic Materials VI
Country/Territory	United States
City	San Diego
Period	17/08/14 → 21/08/14

Keywords

Indirect transition
Dynamic frequency shift
Photonic crystal waveguides
On-chip
Silicon photonics
Crystal wave-guides
Electromagnetic-waves
Ionization front
Conversion
Silicon
Light

Access to Document

10.1117/12.2063078

Li_2014_SPIE_Indirect
Munoz, M. C., Petrov, A. Y., O'Faolain, L., Li, J., Krauss, T. F., & Eich, M., "Indirect transitions of a signal interacting with a moving refractive index front," In Subramania, G. S., & Foteinopoulou, S. (Eds.), Active Photonic Materials VI. (Proceedings of SPIE), 9162 (2014). Copyright 2014 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Final published version, 427 KB

Cite this

@inproceedings{b782d1684dcc46629e5fcfad8396ab2d,

title = "Indirect transitions of a signal interacting with a moving refractive index front",

abstract = "The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects can be potentially realized with a refractive index modulation as small as 0.001.For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect transition and not by a direct transition without wave vector variation.",

keywords = "Indirect transition, Dynamic frequency shift, Photonic crystal waveguides, On-chip, Silicon photonics, Crystal wave-guides, Electromagnetic-waves, Ionization front, Conversion, Silicon, Light",

author = "Munoz, {Michel Castellanos} and Petrov, {Alexander Yu} and Liam O'Faolain and Juntao Li and Krauss, {Thomas F.} and Manfred Eich",

note = "This research was supported by the German Research Foundation DFG (EI 391/12-2).; Conference on Active Photonic Materials VI ; Conference date: 17-08-2014 Through 21-08-2014",

year = "2014",

doi = "10.1117/12.2063078",

language = "English",

volume = "9162",

series = "Proceedings of SPIE",

publisher = "SPIE",

editor = "GS Subramania and S Foteinopoulou",

booktitle = "Active Photonic Materials VI",

address = "United States",

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Munoz, MC, Petrov, AY, O'Faolain, L, Li, J, Krauss, TF & Eich, M 2014, Indirect transitions of a signal interacting with a moving refractive index front. in GS Subramania & S Foteinopoulou (eds), Active Photonic Materials VI. vol. 9162, Proceedings of SPIE, vol. 9162, SPIE, Bellingham, Conference on Active Photonic Materials VI, San Diego, United States, 17/08/14. https://doi.org/10.1117/12.2063078

Indirect transitions of a signal interacting with a moving refractive index front. / Munoz, Michel Castellanos; Petrov, Alexander Yu; O'Faolain, Liam et al.
Active Photonic Materials VI. ed. / GS Subramania; S Foteinopoulou. Vol. 9162 Bellingham: SPIE, 2014. (Proceedings of SPIE; Vol. 9162).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Indirect transitions of a signal interacting with a moving refractive index front

AU - Munoz, Michel Castellanos

AU - Petrov, Alexander Yu

AU - O'Faolain, Liam

AU - Li, Juntao

AU - Krauss, Thomas F.

AU - Eich, Manfred

N1 - This research was supported by the German Research Foundation DFG (EI 391/12-2).

PY - 2014

Y1 - 2014

N2 - The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects can be potentially realized with a refractive index modulation as small as 0.001.For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect transition and not by a direct transition without wave vector variation.

AB - The dynamic manipulation of light can be achieved by the interaction of a signal pulse propagating through or reflected from a refractive index front. Both the frequency and the wave vector of the signal are changed in this case, which is generally referred to as an indirect transition. We have developed a theory to describe such transitions in integrated photonic crystal waveguides. Through indirect transitions, the following effects can be envisaged: large frequency shifts and light stopping and order of magnitude pulse compression and broadening without center frequency shift. All effects can be potentially realized with a refractive index modulation as small as 0.001.For the experimental realization, we have used slow light photonic crystal waveguides in silicon. The refractive index front was obtained by free carriers generation with a switching pulse co-propagating with the signal in the same slow light waveguide. The group velocities of the signal and the front could be varied arbitrarily by choosing the right frequencies of the signal and switching pulses. The indirect transition was unambiguously demonstrated by considering two situations: a) the front overtaking the signal and b) the signal overtaking the front. In both cases, a blue shift of the signal frequency was observed. This blue shift can only be explained by the occurrence of the expected indirect transition and not by a direct transition without wave vector variation.

KW - Indirect transition

KW - Dynamic frequency shift

KW - Photonic crystal waveguides

KW - On-chip

KW - Silicon photonics

KW - Crystal wave-guides

KW - Electromagnetic-waves

KW - Ionization front

KW - Conversion

KW - Silicon

KW - Light

U2 - 10.1117/12.2063078

DO - 10.1117/12.2063078

M3 - Conference contribution

VL - 9162

T3 - Proceedings of SPIE

BT - Active Photonic Materials VI

A2 - Subramania, GS

A2 - Foteinopoulou, S

PB - SPIE

CY - Bellingham

T2 - Conference on Active Photonic Materials VI

Y2 - 17 August 2014 through 21 August 2014

ER -

Indirect transitions of a signal interacting with a moving refractive index front

Abstract

Publication series

Conference

Keywords

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