668 citations · 2.2k across the 24 of their papers we have counts for
24 papers
Electrically pumped semiconductor laser with low spatial coherence and directional emission
Kyungduk Kim, Stefan Bittner, Yongquan Zeng +3
We design and fabricate an on-chip laser source that produces a directional beam with low spatial coherence. The lasing modes are based on the axial orbit in a stable cavity and ha…
Random-laser dynamics with temporally modulated pump
Stefan Bittner, Sebastian Knitter, Seng Fatt Liew +1
We present an experimental study of the effects of temporal modulation of the pump intensity on a random laser. The nanosecond pump pulses exhibit rapid intensity fluctuations whic…
Intracavity frequency-doubled degenerate laser
Seng Fatt Liew, Sebastian Knitter, Sascha Weiler +5
We develop a green light source with low spatial coherence via intracavity frequency doubling of a solid-state degenerate laser. The second harmonic emission supports many more tra…
Controlling mode competition by tailoring the spatial pump distribution in a laser: A resonance-based approach
Alexander Cerjan, Brandon Redding, Li Ge +3
We introduce a simplified version of the steady-state ab initio laser theory for calculating the effects of mode competition in continuous wave lasers using the passive cavity reso…
Correlation-enhanced control of wave focusing in disordered media
Chia Wei Hsu, Seng Fatt Liew, Arthur Goetschy +2
A fundamental challenge in physics is controlling the propagation of waves in disordered media despite strong scattering from inhomogeneities. Spatial light modulators enable one t…
Evanescently coupled multimode spiral spectrometer
Brandon Redding, Seng Fatt Liew, Yaron Bromberg +2
We designed a high-resolution compact spectrometer based on an evanescently-coupled multimode spiral waveguide. Interference between the modes in the waveguide forms a wavelength-d…
Broadband multimode fiber spectrometer
Seng Fatt Liew, Brandon Redding, Michael A. Choma +2
A general-purpose all-fiber spectrometer is demonstrated to overcome the trade-off between spectral resolution and bandwidth. By integrating a wavelength division multiplexer with…
Minimum reflection channel in amplifying random media
Seng Fatt Liew, Hui Cao
We present a numerical study on the minimum reflection channel in a disordered waveguide and its modification by coherent amplification of light. The minimum reflection channel is…
Control of mesoscopic transport by modifying transmission channels in opaque media
Raktim Sarma, Alexey Yamilov, Seng Fatt Liew +2
While controlling particle diffusion in a confined geometry is a popular approach taken by both natural and artificial systems, it has not been widely adopted for controlling light…
Coherent control of photocurrent in a strongly scattering photoelectrochemical system
Seng Fatt Liew, Sebastien M. Popoff, Stafford W. Sheehan +4
A fundamental issue that limits the efficiency of many photoelectrochemical systems is that the photon absorption length is typically much longer than the electron diffusion length…
Modification of light transmission channels by inhomogeneous absorption in random media
Seng Fatt Liew, Hui Cao
Optical absorption is omnipresent and very often distributed non-uniformly in space. We present a numerical study on the effects of inhomogeneous absorption on transmission eigench…
Pump-Controlled Modal Interactions in Microdisk Lasers
Seng Fatt Liew, Li Ge, Brandon Redding +2
We demonstrate an effective control of nonlinear interactions of lasing modes in a semiconductor microdisk cavity by shaping the pump profile. A target mode is selected at the expe…
Topological defect lasers
Sebastian Knitter, Seng Fatt Liew, Wen Xiong +3
We demonstrate topological defect lasers in a GaAs membrane with embedded InAs quantum dots. By introducing a disclination to a square-lattice of elliptical air holes, we obtain sp…
Photonic crystals with topological defects
Seng Fatt Liew, Sebastian Knitter, Wen Xiong +1
We introduce topological defect to a square lattice of elliptical cylinders. Despite the broken translational symmetry, the long-range positional order of the cylinders leads to re…
Active control of emission directionality of semiconductor microdisk lasers
Seng Fatt Liew, Brandon Redding, Li Ge +2
We demonstrate lasing mode selection in nearly circular semiconductor microdisks by shaping the spatial profile of optical pump. Despite of strong mode overlap, adaptive pumping su…
Transmission channels for light in absorbing random media: from diffusive to ballistic-like transport
Seng Fatt Liew, Sebastien M. Popoff, Allard P. Mosk +2
While the absorption of light is ubiquitous in nature and in applications, the question remains how absorption modifies the transmission channels in random media. We present a nume…
Coherent control of total transmission of light through disordered media
S. M. Popoff, A. Goetschy, S. F. Liew +2
We demonstrate order of magnitude coherent control of total transmission of light through random media by shaping the wavefront of the input light. To understand how the finite ill…
On-Chip Random Spectrometer
Brandon Redding, Seng Fatt Liew, Raktim Sarma
Light scattering in disordered media has been studied extensively due to its prevalence in natural and artificial systems [1]. In the field of photonics most of the research has fo…
Localized photonic bandedge modes and orbital angular momenta of light in a golden-angle spiral
Seng Fatt Liew, Heeso Noh, Jacob Trevino +2
We present a numerical study on photonic bandgap and bandedge modes in the golden-angle spiral array of air cylinders in dielectric media. Despite the lack of long-range translatio…
Photonic Band Gaps in 3D Network Structures with Short-range Order
Seng Fatt Liew, Jin-Kyu Yang, Heeso Noh +4
We present a systematic study of photonic band gaps (PBGs) in three-dimensional (3D) photonic amorphous structures (PAS) with short-range order. From calculations of the density of…
Photonic Band Gap Effects in Two-dimensional Polycrystalline and Amorphous Structures
Jin-Kyu Yang, Carl F. Schreck, Heeso Noh +4
We study numerically the density of optical states (DOS) in two-dimensional photonic structures with short-range positional order, and observe a clear transition from polycrystalli…
How non-iridescent colors are generated by quasi-ordered structures of bird feathers
Heeso Noh, Seng Fatt Liew, Vinodkumar Saranathan +4
We investigated the mechanism of structural coloration by quasi-ordered nanostructures in bird feather barbs. Small-angle X-ray scattering (SAXS) data reveal the structures are iso…
Double scattering of light from biophotonic nanostructures with short-range order
Heeso Noh, Seng Fatt Liew, Vinodkumar Saranathan +4
We investigate the physical mechanism for color production by isotropic nanostructures with short-range order in bird feather barbs. While the primary peak in optical scattering sp…
Biomimetic isotropic nanostructures for structural coloration
Jason D. Forster, Heeso Noh, Seng Fatt Liew +9
We describe the self-assembly of biomimetic isotropic films which display structural color amenable to potential applications in coatings. Isotropic structures can produce color if…