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Electronic control of coherence in a two-dimensional array of photonic crystal surface emitting lasers.

Taylor RJ, Childs DT, Ivanov P, Stevens BJ, Babazadeh N, Crombie AJ, Ternent G, Thoms S, Zhou H, Hogg RA - Sci Rep (2015)

Bottom Line: We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned PCSEL elements.This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers.Mutual coherence of the PCSEL elements is verified through the demonstration of a two-dimensional Young's Slits experiment.

View Article: PubMed Central - PubMed

Affiliation: Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom.

ABSTRACT
We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned PCSEL elements. This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers. Mutual coherence of the PCSEL elements is verified through the demonstration of a two-dimensional Young's Slits experiment. In addition to allowing the all-electronic control of the interference pattern, this type of device offers new routes to power and brightness scaling in semiconductor lasers, and opportunities for all-electronic beam steering.

No MeSH data available.


Near field images of two PCSELs overlaid where; (a) the two PCSELs are sub-threshold and the coupler is in loss, (b) the two PCSELs are subthreshold and the coupler is in transparency, (c) the two PCSELs are lasing and the coupler is in loss, (d) the two PCSELs lasing and the coupler is in transparency, (e) two diagonally separated PCSELs are lasing and the coupler is in loss, (f) two diagonally separated PCSELs are lasing and the coupler is in transparency. The right hand column shows a schematic of the drive conditions of the array.
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f3: Near field images of two PCSELs overlaid where; (a) the two PCSELs are sub-threshold and the coupler is in loss, (b) the two PCSELs are subthreshold and the coupler is in transparency, (c) the two PCSELs are lasing and the coupler is in loss, (d) the two PCSELs lasing and the coupler is in transparency, (e) two diagonally separated PCSELs are lasing and the coupler is in loss, (f) two diagonally separated PCSELs are lasing and the coupler is in transparency. The right hand column shows a schematic of the drive conditions of the array.

Mentions: Figure 3 shows the near field images of two PCSELs which are projected and overlaid onto a camera in order to explore their mutual coherence. Figure 3(a) shows the case where the two PCSELs are operated sub-threshold (60 mA) and the coupler is in loss (200 mA). Figure 3(b) shows the combined near-field pattern under the same situation (both sub-threshold) but with the coupler now in transparency (220 mA). In both cases, as expected for spontaneous emission sources, there is no evidence for coherence. An increase in intensity is observed for the case where the coupler is in transparency which is attributed to additional amplified spontaneous emission from the coupler and neighbouring PCSEL.


Electronic control of coherence in a two-dimensional array of photonic crystal surface emitting lasers.

Taylor RJ, Childs DT, Ivanov P, Stevens BJ, Babazadeh N, Crombie AJ, Ternent G, Thoms S, Zhou H, Hogg RA - Sci Rep (2015)

Near field images of two PCSELs overlaid where; (a) the two PCSELs are sub-threshold and the coupler is in loss, (b) the two PCSELs are subthreshold and the coupler is in transparency, (c) the two PCSELs are lasing and the coupler is in loss, (d) the two PCSELs lasing and the coupler is in transparency, (e) two diagonally separated PCSELs are lasing and the coupler is in loss, (f) two diagonally separated PCSELs are lasing and the coupler is in transparency. The right hand column shows a schematic of the drive conditions of the array.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4542471&req=5

f3: Near field images of two PCSELs overlaid where; (a) the two PCSELs are sub-threshold and the coupler is in loss, (b) the two PCSELs are subthreshold and the coupler is in transparency, (c) the two PCSELs are lasing and the coupler is in loss, (d) the two PCSELs lasing and the coupler is in transparency, (e) two diagonally separated PCSELs are lasing and the coupler is in loss, (f) two diagonally separated PCSELs are lasing and the coupler is in transparency. The right hand column shows a schematic of the drive conditions of the array.
Mentions: Figure 3 shows the near field images of two PCSELs which are projected and overlaid onto a camera in order to explore their mutual coherence. Figure 3(a) shows the case where the two PCSELs are operated sub-threshold (60 mA) and the coupler is in loss (200 mA). Figure 3(b) shows the combined near-field pattern under the same situation (both sub-threshold) but with the coupler now in transparency (220 mA). In both cases, as expected for spontaneous emission sources, there is no evidence for coherence. An increase in intensity is observed for the case where the coupler is in transparency which is attributed to additional amplified spontaneous emission from the coupler and neighbouring PCSEL.

Bottom Line: We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned PCSEL elements.This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers.Mutual coherence of the PCSEL elements is verified through the demonstration of a two-dimensional Young's Slits experiment.

View Article: PubMed Central - PubMed

Affiliation: Department of Electronic &Electrical Engineering, Centre for Nanoscience &Technology, North Campus, The University of Sheffield, Broad Lane, Sheffield, S3 7HQ, United Kingdom.

ABSTRACT
We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned PCSEL elements. This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers. Mutual coherence of the PCSEL elements is verified through the demonstration of a two-dimensional Young's Slits experiment. In addition to allowing the all-electronic control of the interference pattern, this type of device offers new routes to power and brightness scaling in semiconductor lasers, and opportunities for all-electronic beam steering.

No MeSH data available.