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Observation of far-infrared emission from excited cytosine molecules
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10.1063/1.1968412
/content/aip/journal/apl/87/1/10.1063/1.1968412
http://aip.metastore.ingenta.com/content/aip/journal/apl/87/1/10.1063/1.1968412
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic representation of the experimental apparatus. Near single-cycle THz pulses are generated from a biased GaAs photoconductive (PC) emitter. The electric field of the transmitted THz pulse is then detected as a function of time using a thick ⟨110⟩ ZnTe crystal via broadband electro-optic (EO) sampling. Inset: Schematic representation of the THz radiation before (left) and after (right) transmission through a sample. In the frequency domain, the absorption simply causes a spectral dip (bottom-right) at the resonance frequency of the sample. In the time domain, absorption is followed by subsequent radiation of a decaying electric field (solid curve, top right), in addition to the transmitted THz pulse (dashed curve, top right).

Image of FIG. 2.
FIG. 2.

THz pulse measured in the absence of a sample (curve 1) and after transmission through a polycrystalline cytosine sample at (curve 2). Fast oscillations are observed (in curve 2) immediately after the main peak (see inset). Curve 3 shows an amplified portion of curve 2 between 3 and (dotted line) weighted by a Gaussian window centred at . All signals are vertically offset for clarity. Inset shows the measured (point) and calculated (line) THz signal between 3.5 and .

Image of FIG. 3.
FIG. 3.

(a) The time-partitioned Fourier transform spectra of the measured THz signals for cytosine at . The time interval between two adjacent curves is , with the time on the left-hand side of the graph being the center of the wide Gaussian window. The top curve is the transmission spectrum of cytosine. (b) The time-partitioned Fourier transform of the simulated THz data for a Lorenz oscillator . The time on the left-hand side of the graph is the center of the wide Gaussian window. The top curve shows the simulated transmission spectrum.

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/content/aip/journal/apl/87/1/10.1063/1.1968412
2005-06-29
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of far-infrared emission from excited cytosine molecules
http://aip.metastore.ingenta.com/content/aip/journal/apl/87/1/10.1063/1.1968412
10.1063/1.1968412
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