Investigation of dynamic optical study of Bi2Te3 topological insulators thin film based on MWCNT flexible paper using terahertz spectroscopy

Broadband THz absorption using nanosheets of Bi2Te3 grown on a transparent conductor

“…Since the signal is proportional to the time-dependent electric field of the THz pulse, using the eqn (2), the recorded THz transient electric field is Fourier converted to obtain the spectrum information of the THz pulse. 51,52 where E ( t ) is the time dependent amplitude of the electric field and E ( w ) is the frequency dependent amplitude of the electric field. The normalised transmittance is obtained by normalising the amplitude of the FFT of the time signals using a bare substrate as a reference, as illustrated in Fig.…”

“…It is proportional to the density of the absorbing atoms and the absorption cross-section. It can be calculated by using eqn (4) 51,52 where α is the absorption coefficient, d is the thickness of the substrate and T is the transmission function which is defined as. 51,52 The absorption coefficient of the nanosheets of the TIs measured by THz-TDS at room temperature is shown in Fig.…”

“…Since the signal is proportional to the timedependent electric field of the THz pulse, using the eqn (2), the recorded THz transient electric field is Fourier converted to obtain the spectrum information of the THz pulse. 51,52…”

“…It is proportional to the density of the absorbing atoms and the absorption cross-section. It can be calculated by using eqn (4) 51,52…”

“…where a is the absorption coefficient, d is the thickness of the substrate and T is the transmission function which is defined as. 51,52 T w…”