TY - JOUR
T1 - Second-harmonic generation in lithium niobate nanowires for local fluorescence excitation
AU - Sergeyev, Anton
AU - Geiss, Reinhard
AU - Solntsev, Alexander S.
AU - Steinbrück, Andrea
AU - Schrempel, Frank
AU - Kley, Ernst Bernhard
AU - Pertsch, Thomas
AU - Grange, Rachel
PY - 2013/8/12
Y1 - 2013/8/12
N2 - We study the nonlinear optical properties of lithium niobate (LiNbO3) nanowires (NWs) fabricated by a top-down ion beam enhanced etching method. First, we demonstrate generation and propagation of the second-harmonic (SH) light in LiNbO3 NWs of typical rectangular crosssections of 400 x 600 nm2 and length from 10 to 50 μm. Then, we show local fluorescent excitation of 4',6-diamidino-2-phenylindole (DAPI) dye with the propagated SH signal in standard concentrations as for biological applications. By measuring the detected average power of the propagated fundamental harmonic (FH) and the SH signal at the output of the NWs, we directly prove the dominating role of the SH signal over possible twophoton excitation processes with the FH in the DAPI dye. We estimate that 63 ± 6 pW of the propagated SH average power is required for detectable dye excitation. Finally, we model the waveguiding of the SH light to determine the smallest NW cross-section (around 40x60 nm2) which is potentially able to excite fluorescence with a FH intensity below the cell damage threshold.
AB - We study the nonlinear optical properties of lithium niobate (LiNbO3) nanowires (NWs) fabricated by a top-down ion beam enhanced etching method. First, we demonstrate generation and propagation of the second-harmonic (SH) light in LiNbO3 NWs of typical rectangular crosssections of 400 x 600 nm2 and length from 10 to 50 μm. Then, we show local fluorescent excitation of 4',6-diamidino-2-phenylindole (DAPI) dye with the propagated SH signal in standard concentrations as for biological applications. By measuring the detected average power of the propagated fundamental harmonic (FH) and the SH signal at the output of the NWs, we directly prove the dominating role of the SH signal over possible twophoton excitation processes with the FH in the DAPI dye. We estimate that 63 ± 6 pW of the propagated SH average power is required for detectable dye excitation. Finally, we model the waveguiding of the SH light to determine the smallest NW cross-section (around 40x60 nm2) which is potentially able to excite fluorescence with a FH intensity below the cell damage threshold.
UR - http://www.scopus.com/inward/record.url?scp=84881488181&partnerID=8YFLogxK
U2 - 10.1364/OE.21.019012
DO - 10.1364/OE.21.019012
M3 - Article
SN - 1094-4087
VL - 21
SP - 19012
EP - 19021
JO - Optics Express
JF - Optics Express
IS - 16
ER -