Abstract

Two femtosecond Ti:sapphire lasers with slightly different repetition rates near 1GHz are coupled to implement high-speed asynchronous optical sampling. The application of this technique is successfully demonstrated in the field of terahertz time-domain spectroscopy (TDS). A time delay of 1ns is scanned at a frequency of 5kHz without moving mechanical parts. Compared with that of conventional TDS schemes based on lock-in detection and moving mirrors, the readout time of integrated resonant THz sensors is reduced by a factor of 20, opening the way for high-throughput THz sensing in marker-free DNA analysis.

© 2005 Optical Society of America

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[CrossRef] [PubMed]

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Dienes, A.

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Fiechtner, G. J.

Grahn, H. T.

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Harmon, S. A.

S. A. Harmon and R. A. Cheville, Appl. Phys. Lett. 85, 2128 (2004).
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Kafka, J. D.

King, G. B.

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M. Nagel, F. Richter, P. Haring Bolivar, and H. Kurz, Phys. Med. Biol. 48, 3625 (2003).
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H. T. Grahn, H. J. Maris, and J. Tauc, IEEE J. Quantum Electron. 25, 2562 (1989).
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T. Pfeifer, H. M. Heiliger, T. Löffler, C. Ohlhoff, C. Meyer, G. Lüpke, H. G. Roskos, and H. Kurz, IEEE J. Sel. Top. Quantum Electron. 2, 586 (1996).
[CrossRef]

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S. Adachi, A. Takeyama, Y. Takagi, A. Tackeuchi, and S. Muto, Appl. Phys. Lett. 68, 964 (1996).
[CrossRef]

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M. Nagel, F. Richter, P. Haring Bolivar, and H. Kurz, Phys. Med. Biol. 48, 3625 (2003).
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Ohlhoff, C.

T. Pfeifer, H. M. Heiliger, T. Löffler, C. Ohlhoff, C. Meyer, G. Lüpke, H. G. Roskos, and H. Kurz, IEEE J. Sel. Top. Quantum Electron. 2, 586 (1996).
[CrossRef]

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T. Pfeifer, H. M. Heiliger, T. Löffler, C. Ohlhoff, C. Meyer, G. Lüpke, H. G. Roskos, and H. Kurz, IEEE J. Sel. Top. Quantum Electron. 2, 586 (1996).
[CrossRef]

Pieterse, J. W.

Richter, F.

M. Nagel, F. Richter, P. Haring Bolivar, and H. Kurz, Phys. Med. Biol. 48, 3625 (2003).
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Roskos, H. G.

T. Pfeifer, H. M. Heiliger, T. Löffler, C. Ohlhoff, C. Meyer, G. Lüpke, H. G. Roskos, and H. Kurz, IEEE J. Sel. Top. Quantum Electron. 2, 586 (1996).
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[CrossRef]

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S. Adachi, A. Takeyama, Y. Takagi, A. Tackeuchi, and S. Muto, Appl. Phys. Lett. 68, 964 (1996).
[CrossRef]

Takagi, Y.

S. Adachi, A. Takeyama, Y. Takagi, A. Tackeuchi, and S. Muto, Appl. Phys. Lett. 68, 964 (1996).
[CrossRef]

S. Adachi, S. Takeyama, and Y. Takagi, Opt. Commun. 117, 71 (1995).
[CrossRef]

Takeyama, A.

S. Adachi, A. Takeyama, Y. Takagi, A. Tackeuchi, and S. Muto, Appl. Phys. Lett. 68, 964 (1996).
[CrossRef]

Takeyama, S.

S. Adachi, S. Takeyama, and Y. Takagi, Opt. Commun. 117, 71 (1995).
[CrossRef]

Tauc, J.

H. T. Grahn, H. J. Maris, and J. Tauc, IEEE J. Quantum Electron. 25, 2562 (1989).
[CrossRef]

Watts, M. L.

Xu, J.

Yankelevich, D.

Zhang, X.-C.

Appl. Opt. (2)

Appl. Phys. Lett. (2)

S. Adachi, A. Takeyama, Y. Takagi, A. Tackeuchi, and S. Muto, Appl. Phys. Lett. 68, 964 (1996).
[CrossRef]

S. A. Harmon and R. A. Cheville, Appl. Phys. Lett. 85, 2128 (2004).
[CrossRef]

IEEE J. Quantum Electron. (1)

H. T. Grahn, H. J. Maris, and J. Tauc, IEEE J. Quantum Electron. 25, 2562 (1989).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (2)

T. Pfeifer, H. M. Heiliger, T. Löffler, C. Ohlhoff, C. Meyer, G. Lüpke, H. G. Roskos, and H. Kurz, IEEE J. Sel. Top. Quantum Electron. 2, 586 (1996).
[CrossRef]

G. Sucha, M. E. Fermann, D. J. Harter, and M. Hofer, IEEE J. Sel. Top. Quantum Electron. 2, 605 (1996).
[CrossRef]

Opt. Commun. (1)

S. Adachi, S. Takeyama, and Y. Takagi, Opt. Commun. 117, 71 (1995).
[CrossRef]

Opt. Lett. (5)

Phys. Med. Biol. (1)

M. Nagel, F. Richter, P. Haring Bolivar, and H. Kurz, Phys. Med. Biol. 48, 3625 (2003).
[CrossRef] [PubMed]

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Figures (3)

Fig. 1
Fig. 1

Experimental setup that comprises two fs lasers at a 1 - GHz repetition rate and an integrated resonant THz sensor. The repetition rates are locked to two synthesizers, sharing a common time base by use of two PLLs. The trigger signal for the data-acquisition system is generated by use of a nonlinear Li I O 3 crystal (NLC).

Fig. 2
Fig. 2

(a) Time-domain transmission signal as mapped by ASOPS at Δ f r = 5 kHz (250,000 scans, darker curve) and by a standard lock-in detection scheme based on moving mirrors (single scan, lighter curve). The transients are offset vertically for clarity. (b) Corresponding Fourier-transform spectra (normalized).

Fig. 3
Fig. 3

Inset, time-domain data with and without a polymer coating on the resonator structure. Larger figure, corresponding fast-Fourier-transform (FFT) spectra (normalized).

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