Tunneling of Optical Pulses through Photonic Band Gaps

The Sommerfeld precursor in photonic crystals

“…This allows for applications of photonic crystals as optical delay lines or as data storage compounds [5]. Not only small group velocities have been observed in photonic crystals, also superluminal group velocities and photon tunnelling have been measured [6][7][8][9].…”

Experimental and Theoretical Studies of a Broadband Superluminality in Fabry-Perot Interferometer

“…The inset in Fig. 5(a) displays the transmission under the off-resonance condition; it is approximately constant (3.2%) and independent of the selected lengths, whereas the transmission in the photonic-bandgap tunneling experiment is inversely proportional to the length [17]. Consequently, these two aforementioned features -constant group velocity and constant transmission with respect to the propagation length suggest that the renowned generalized Hartman effect is valid only for extremely low boundary transmission, e.g., opaque-barrier boundaries, but not applicable to the high transmission case (boundary transmission rate (T ∼ 0.3) under this study.…”

“…3(c) is obtained at the case of h/b = 0.09, in which the transmission approximately equals 3.2%. This undersized waveguide system is not equivalent to a single opaque barrier [9][10][11][12][13][14][15][16][17], because the signal of fundamental mode does propagate within the middle section, and thus the transmission in superluminal regime is significantly higher than that of single-barrier system.…”

“…Such phenomenon called superluminality is generally attributed to steep anomalous dispersion [1][2][3][4][5][6][7][8] and tunneling effect [9][10][11][12][13][14][15][16][17], which have been experimentally demonstrated in the electromagneticallyinduced-absorption [1][2][3][4][5]/ring-resonator [6][7][8] optical systems and the photonic/waveguide [9][10][11][12][13][14][15][16][17] systems, respectively. However, the systems employing the anomalous dispersion usually operate near the steep absorption line, which leads to a narrow superluminal frequency range as well as low transmission (for passive systems), while the systems associated with the tunneling mechanism also suffer from extremely low transmission [16][17][18][19][20][21][22][23][24][25][26]. Therefore, finding a new mechanism that supports both relat...…”

Ultrafast Interferometric Studies of Multiple Scattering of Light in Photonic Structures

“…[2] Elucidation of the dynamics of wave packet propagation in the photonic structure requires ultrafast spectroscopic techniques. [3] Further, the use of high peak-intensity femtosecond pulses opens possibilities to exploit the nonlinearity of photonic materials. [4] Scattering of light plays a critical role in many important phenomena including multiple scattering as a precursor for light localization in a random medium.…”