Photonic gap in amorphous photonic materials

Jin, Changjie; Meng, Xiaodong; Cheng, Bingying; Li, Zhaolin; Zhang, Daozhong

doi:10.1103/physrevb.63.195107

Cited by 105 publications

(94 citation statements)

References 14 publications

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“…However, isolated dielectric pillars provide much stronger scattering efficiency than air holes for TM polarized light. Previous studies show that a strong bandgap can be supported by photonic lattices formed by isolated pillars 30,31 . Since electrical pumping requires direct electrical contact to the pillars, we adopt a "double-metal waveguide" design, enclosing the pillars between parallel metal layers.…”

Section: Design Of the 2d Thz Random Lasermentioning

confidence: 99%

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Zeng

Liang

et al. 2016

ACS Photonics

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Random lasers are a special class of laser in which light is confined through multiple scattering and interference process in a disordered medium, without a traditional optical cavity. They have been widely studied to investigate fundamental phenomena such as Anderson localization, and for applications such as speckle-free imaging, benefitting from multiple lasing modes. However, achieving controlled localized multi-mode random lasing at long wavelengths, such as in the terahertz (THz) frequency regime, remains a challenge.Here, we study devices consisting of randomly-distributed pillars fabricated from a quantum cascade gain medium, and show that such structures can achieve transversemagnetic polarized (TM) multi-mode random lasing, with strongly localized modes at THz frequencies. The weak short-range order induced by the pillar distribution is sufficient to ensure high quality-factor modes that have a large overlap with the active material.Furthermore, the emission spectrum can be easily tuned by tailoring the scatterer size and filling fraction. These "designer" random lasers, realized using standard photolithography 2 techniques, provide a promising platform for investigating disordered photonics with predesigned randomness in the THz frequency range, and may have potential applications such as speckle-free imaging.

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Section: Design Of the 2d Thz Random Lasermentioning

confidence: 99%

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Zeng

Liang

et al. 2016

ACS Photonics

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“…The change in transport properties is accompanied by a reduction in the local density of states, which results in increased lifetimes for embedded light emitters such as fluorescent molecules [8]. Interestingly, it appears that many of these unique properties are not tied exclusively to crystalline structures [9][10][11][12][13][14][15][16][17]. In a recent numerical study Florescu et al demonstrated that particular designer disordered materials can display large, complete photonic band gaps in two dimensions [14].…”

Section: Introductionmentioning

confidence: 99%

Direct laser writing of three-dimensional network structures as templates for disordered photonic materials

2013

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In the present article we substantially expand on our recent study about the fabrication of mesoscale polymeric templates of disordered photonic network materials [Haberko and Scheffold, Opt. Expr. 21, 1057 (2013)]. We present a detailed analysis and discussion of important technical aspects related to the fabrication and characterization of these fascinating materials. Compared to our initial report we were able to reduce the typical structural length scale of the seed pattern from a = 3.3 μm to a = 2 μm, bringing it closer to the technologically relevant fiber-optic communications wavelength range around λ ∼ 1.5 μm. We have employed scanning electron microscopy coupled with focused ion beam cutting to look inside the bulk of the samples of different heights. Moreover, we demonstrate the use of laser scanning confocal microscopy to assess the real space structure of the samples fabricated by direct laser writing. We address in detail questions about scalability, finite size effects, and geometrical distortions. We also study the effect of the lithographic voxel shape, that is, the ellipsoidal shape of the laser pen used in the fabrication process. To this end we employ detailed numerical modeling of the scattering function using a discrete dipole approximation scheme.

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“…However, Jin et al have recently shown the existence of PBGs in two-dimensional amorphous photonic materials which do not possess any long-range order but have short-range order. [18] A PBG in an amorphous photonic material overlaps the first PBG of a corresponding square-lattice PC. Thus, Jin et al suggested that only short-range order of the square-lattice PC is necessary for formation of the first PBG.…”

Section: Isotropic Photonic Band Gapmentioning

confidence: 99%

Isotropic photonic band gap and anisotropic structures in transmission spectra of two-dimensional fivefold and eightfold symmetric quasiperiodic photonic crystals

et al. 2002

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We measured and calculated transmission spectra of two-dimensional quasiperiodic photonic crystals (PCs) based on a 5-fold (Penrose) or 8-fold (octagonal) symmetric quasiperiodic pattern. The photonic crystal consisted of dielectric cylindrical rods in air placed normal to the basal plane on vertices of tiles composing the quasiperiodic pattern. An isotropic photonic band gap (PBG) appeared in the TM mode, where electric fields were parallel to the rods, even when the real part of a dielectric constant of the rod was as small as 2.4. An isotropic PBG-like dip was seen in tiny Penrose and octagonal PCs with only 6 and 9 rods, respectively. These results indicate that local multiple light scattering within the tiny PC plays an important role in the PBG formation. Besides the isotropic PBG, we found dips depending on the incident angle of the light. This is the first report of anisotropic structures clearly observed in transmission spectra of quasiperiodic PCs. Based on rod-number and rod-arrangement dependence, it is thought that the shapes and positions of the anisotropic dips are determined by global multiple light scattering covering the whole system. In contrast to the isotropic PBG due to local light scattering, we could not find any PBGs due to global light scattering even though we studied transmission spectra of a huge Penrose PC with 466 rods.

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Photonic gap in amorphous photonic materials

Cited by 105 publications

References 14 publications

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Designer Multimode Localized Random Lasing in Amorphous Lattices at Terahertz Frequencies

Direct laser writing of three-dimensional network structures as templates for disordered photonic materials

Isotropic photonic band gap and anisotropic structures in transmission spectra of two-dimensional fivefold and eightfold symmetric quasiperiodic photonic crystals

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