Flatband slow light in photonic crystals featuring spatial pulse compression and terahertz bandwidth

Settle, Michael; Engelen, R.J.P.; Salib, M. S.; Michaeli, Albert; Kuipers, L.; Krauss, Thomas F.

doi:10.1364/oe.15.000219

Cited by 164 publications

(100 citation statements)

References 18 publications

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“…A coherent photon population prepared in the bare waveguide can be abruptly transferred into the polariton bands, thus decreasing its group velocity by a factor of up to 13. In this regards, our results compare advantageously with broadband generation of slow light in PCs [7,8]. More strikingly, our scheme provides, for the first time, access to a regime of nonadiabatic slow light generation by enabling sub-cycle modulation of the group velocity via an optically controlled USC.…”

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confidence: 60%

Sub-cycle switching of a photonic bandstructure via ultrastrong light-matter coupling

Ménard

Porer

Leitenstorfer

et al. 2013

EPJ Web of Conferences

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Abstract. Phase-locked multi-terahertz transients map out the full photonic bandstructure of a one-dimensional photonic crystal while a 12-fs control pulse activates ultrastrong interaction on a sub-cycle time scale with quantized electronic transitions in semiconductor quantum wells. We trace the build-up dynamics of a large vacuum Rabi splitting and observe an unexpected asymmetric formation of the upper and lower polariton bands. The pronounced flattening of the photonic bands causes a slow-down of the group velocity by one order of magnitude on the time scale of the oscillation period of light.Tailoring optical properties of solids on the sub-wavelength scale has opened exciting possibilities to shape the way light interacts with electronic excitations. Recently, nanostructured optical cavities have been used to reach a new regime of ultrastrong light-matter coupling (USC) where embedded quantum emitters absorb and reemit virtual photons at a rate comparable to the frequency of the bare cavity mode [1][2][3][4]. Nonadiabatic modulation of ultrastrong interaction was predicted to cause unconventional quantum electrodynamical phenomena, such as the release of correlated photon pairs [5]. Experimentally, phase-sensitive multi-THz optoelectronics has been exploited to trace ultrafast activation of USC [2]. First proof-of-principle studies, however, have allowed for a limited control of the dispersion of the photon field only, besides requiring complex coupling geometries.Here, we combine a one-dimensional photonic crystal (PC) with optically switchable intersubband (ISB) resonances of semiconductor quantum wells (QWs) in order to approach full spatial and temporal control of light. Phase-locked multi-terahertz transients trace an asymmetric formation of the lower polariton (LP) and upper polariton (UP) branches on a time scale of the oscillation period of light. A pronounced flattening of the photonic bands causes a slow-down of the group velocity by one order of magnitude [6]. The room-temperature switching device operated in straightforward transmission geometry paves the way towards studies of nonadiabatic quantum electrodynamics (QED) phenomena. Figure 1a depicts the design of the semiconductor device used in our experiments. A 2 µm thick Al 0.95 Ga 0.05 As cladding layer followed by a sequence of 50 GaAs/Al 0.33 Ga 0.67 As QWs is epitaxially grown on an undoped GaAs substrate. The QW region supports a planar waveguide mode. A gold grating, with a period of a = 3.6 or 4.1 µm, is then thermally evaporated on the sample surface. The purpose of this grating is twofold: it enables surface plasmon propagation within the QW region and EPJ Web of Conferences

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mentioning

confidence: 60%

Sub-cycle switching of a photonic bandstructure via ultrastrong light-matter coupling

Ménard

Porer

Leitenstorfer

et al. 2013

EPJ Web of Conferences

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“…(3) this expression is replaced by the first 4 terms of its Taylor expansion. The dispersion relation, k(ω), of the PCW is found from a band structure calculation and the parameter values used in this work are chosen using the results of Settle et al [14] as a guideline. The real function f H (ω) accounts for the spectral amplitude filtering.…”

Section: Modelmentioning

confidence: 99%

Theory of passively mode-locked photonic crystal semiconductor lasers

2010

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Abstract:We report the first theoretical investigation of passive mode-locking in photonic crystal mode-locked lasers. Related work has investigated coupled-resonator-optical-waveguide structures in the regime of active mode-locking [Opt. Express 13, 4539-4553 (2005)]. An extensive numerical investigation of the influence of key parameters of the active sections and the photonic crystal cavity on the laser performance is presented. The results show the possibility of generating stable and high quality pulses in a large parameter region. For optimized dispersion properties of the photonic crystal waveguide cavity, the pulses have sub picosecond widths and are nearly transform limited.

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“…To eliminate such distortion, several zero-dispersion devices were developed. [19][20][21][22][23] Moreover, a coupledresonator optical waveguide based on PhC cavities or microrings can also help in compensation of the slow-light device distortions.…”

Section: Introductionmentioning

confidence: 99%

Lateral lattice shift engineered slow light in elliptical photonics crystal waveguides

Hsiao

2014

J. Nanophoton

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Abstract. A photonics crystal (PhC) waveguide that operates in the slow-light regime is reported in this paper. A second line of circular air holes from the PhC waveguide in a triangular lattice is replaced by a line of elliptical air holes. Based on a three-dimensional plane wave expansion, the lateral shift of elliptical air holes is conducted to enhance the slow-light characteristics. A group index of 166 and a delay-bandwidth product of 0.1812 are derived from an optimized PhC using elliptical air holes with a lateral shift of 160 nm according to the simulation results. A MachZehnder interferometer (MZI) is integrated with the above-mentioned PhC waveguide with a 17 μm length in one of its arms. The measured transmission spectrum of the fabricated MZI embedded with a PhC waveguide shows slow-light interference patterns.

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Flatband slow light in photonic crystals featuring spatial pulse compression and terahertz bandwidth

Cited by 164 publications

References 18 publications

Sub-cycle switching of a photonic bandstructure via ultrastrong light-matter coupling

Sub-cycle switching of a photonic bandstructure via ultrastrong light-matter coupling

Theory of passively mode-locked photonic crystal semiconductor lasers

Lateral lattice shift engineered slow light in elliptical photonics crystal waveguides

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