Spectral engineering of semiconductor Fabry-Perot laser cavities in the weakly and strongly perturbed regimes

Adolfsson, Göran; Bengtsson, Jörgen; Larsson, Anders

doi:10.1364/josab.27.000118

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…To calculate the forward problem (i.e. the filter response of a hologram under the influence of gain) accurately we exploit a TMM based on [12], [16]. In brief, the forward and backward propagating waves are related through a system transfer matrix M. This matrix can be expressed as the product of a series of sub-matrices (T i ), governing the propagation and scattering within grating element with an index of n 1 or n 2 .…”

Section: Methodsmentioning

confidence: 99%

“…digital hologram) filter response under the influence of gain. The methodology, which exploits the transfer matrix method (TMM) to calculate the ADFB reflectivity and group delay filter functions, is similar to techniques described in references [12]- [14]. We show that the ADFB gain-reflection response contains infiniteamplification (finite output for zero input) singularities at which the laser oscillation condition is satisfied.…”

Section: Introductionmentioning

confidence: 97%

“…The recently developed discretely tunable aperiodic DFB (ADFB) laser is a strikingly successful example of such an approach [6]- [8], in which multiple defects are incorporated into a grating using aperiodic lattice engineering to simultaneously enable precise frequency selection and tuning. Unlike other approaches [9]- [12], the aperiodic lattice design is not the output of a deterministic mathematical operation; rather it is a computer-optimized digital hologram. The hologram contains a multitude of phase-shifts, the precise locations and sizes of which are set such that they operate collectively to provide a well-defined set of spatial frequency components, as revealed by the Fourier transform (FT) of the hologram [5], [6].…”

Section: Introductionmentioning

confidence: 99%

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Dual-Frequency Defect-Mode Lasing in Aperiodic Distributed Feedback Cavities

Folland

Chakraborty

2016

IEEE Photon. Technol. Lett.

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In this letter we aim to provide the first in-depth study of a multiband hologram filter response under the influence of gain. We find that these aperiodic DFB gratings, which are essentially computer optimized digital holograms, can be inversedesigned to possess multiple defect-like modes analogous to those present in quarter-wave phase shifted gratings. We attribute this phenomenon to the interaction between multiple photonic band gaps in aperiodic DFB cavities. Further examination of the aperiodic DFB gratings reveal that the defect-mode lasing solutions are insensitive to variations of the grating feedback strength (κ). This result in particular, which has important significance to minimize error in fabrication, is confirmed against published experimental data for an aperiodic DFB laser.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Dual-Frequency Defect-Mode Lasing in Aperiodic Distributed Feedback Cavities

Folland

Chakraborty

2016

IEEE Photon. Technol. Lett.

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“…To calculate the properties of the ADFB hologram in the presence of gain we exploit a TMM based on that in refs [30]. The hologram consists of an arbitrary arrangement of high and low refractive index layers of width Λ/2, where Λ is the period of a uniform grating.…”

Section: Fig S4 Graphene-controlled Group Index (A) and (B) Group mentioning

confidence: 99%

Gain modulation by graphene plasmons in aperiodic lattice lasers

Chakraborty

Marshall

Folland

et al. 2016

Science

105

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Two-dimensional graphene plasmon-based technologies will enable the development of fast, compact and inexpensive active photonic elements because, unlike plasmons in other materials, graphene plasmons can be tuned via the doping level. Such tuning is harnessed within terahertz quantum cascade lasers to reversibly alter their emission. This is achieved in two key steps: First by exciting graphene plasmons within an aperiodic lattice laser and, second, by engineering photon lifetimes, linking graphene's Fermi energy with the round-trip gain. Modal gain and hence laser spectra are highly sensitive to the doping of an integrated, electrically controllable, graphene layer. Demonstration of the integrated graphene plasmon laser principle lays the foundation for a new generation of active, programmable plasmonic metamaterials with major implications across photonics, material sciences and nanotechnology.Among the many intriguing properties of graphene, its plasmonic characteristics are some of the most fascinating and potentially useful [1,2]. Long-lived, tunable intrinsic graphene surface plasmons (SP) have already been demonstrated in a number of experiments [3][4][5][6][7][8][9], including optical modulators [10,11], providing the potential for applications [12,13]. In contrast to the noble metals that are usually used in SP devices [13,14], graphene's Fermi energy, E F , and carrier concentration, n s (and therefore its conductivity and SP mode properties), can be altered, for example by electrical gating and surface doping [3,15,16]. Consequently, the behavior of graphene SP-based structures can be modified in situ, without the need for structural device changes. In particular, graphene's optical and plasmonic properties are tunable in the terahertz (THz) spectral region [3,17], giving rise to the possibility of compact electrically controllable THz optical components [18]. We incorporated graphene into a plasmonic THz laser microcavity to dynamically modulate round-trip modal gain values and therefore laser emission via E F . In this way gated graphene becomes a powerful tool with which to control the fundamental properties of a laser -a tool that is potentially extremely fast and all electrical in nature, with negligible electrical power requirements.The interaction between light and matter can be altered by manipulating the electromagnetic density-of-states (DOS) using a micro resonator [19,20]. By incorporating a photonic lattice or plasmonic structure into a laser, one can control the frequency and amplification of resonant modes and hence manipulate the properties of lasing emission [21][22][23]. Furthermore, by breaking the regularity of these structures it is possible to modulate the photon DOS and hence light-matter interaction at several frequencies simultaneously. This technique was used recently to develop an aperiodic distributed feedback (ADFB) cavity laser with a lattice which is in essence a computergenerated hologram [24,25]. The hologram digitally encodes the Fourier transform of a desired optica...

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Plasmonic single-mode Fabry–Perot lasers based on Schottky contact

Liu

Huang

2014

Optics Communications

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Spectral engineering of semiconductor Fabry-Perot laser cavities in the weakly and strongly perturbed regimes

Cited by 10 publications

References 12 publications

Dual-Frequency Defect-Mode Lasing in Aperiodic Distributed Feedback Cavities

Dual-Frequency Defect-Mode Lasing in Aperiodic Distributed Feedback Cavities

Gain modulation by graphene plasmons in aperiodic lattice lasers

Plasmonic single-mode Fabry–Perot lasers based on Schottky contact

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