The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Photon management is a key element to optimize the optical and electro-optical performance of solar cells. Photon management concepts and the potential of 3D photonic crystals for photon management in solar cells are discussed.
Improving the photon to electron conversion efficiency of photodetecting devices including photo sensors and solar cells having an ultrathin-film photoelectric-conversion layer (PECL) is important for several reasons: enhanced carrier extraction, reduced material usage and simplified fabrication processing. In order to achieve this target, an effective method to trap and ultimately absorb photons...
Photonic crystals are widely known for their light-trapping capabilities. This is often associated with the occurrence of a photonic band gap or other suppression in the electromagnetic density of states. This also enables unprecedented forms of strong-coupling between light and matter. A less studied form of light-trapping occurs in the higher bands of a photonic crystal, where the electromagnetic...
We propose and experimentally demonstrate a new approach to the design of Photonic Crystal cavities. Rather than simply maximizing the design Q-factor, we take the effects of disorder into account, and develop a design that provides superior Q factors in the presence of disorder relative to existing designs.
A novel photonic crystal cavity is proposed for applications with strict area limitations. Initial FDTD simulations shows higher Q-factor at the cost of a larger mode volume when compared with an optimized H1 cavity.
This paper reports the high light extraction efficiency will be obtained by considering the systematic design of two-dimensional sub-wavelength photonic crystals, which is created on the p-side of InGaN-based light emitting diodes.
We demonstrate the first sub-100 µm, 10 Gb/s Si MZI optical modulator. Slow-light photonic crystal waveguides enable carrier-depletion, near-error-free modulation in a 90 µm device by a 4.3 Vpp drive signal, with 17 nm bandwidth.
We propose to obtain larger-area single-mode photonic crystal surface-emitting lasers by increasing the mode-spacing at the bandedge where the dispersions form an accidental Dirac-point at the center of the Brillouin zone.
A new design of vertical waveguide is investigated for on-demand three-dimensional light guiding in three-dimensional photonic crystals. Optical characterization successfully demonstrates that the wide-band vertical guiding is realized in a fabricated photonic crystal.
We experimentally detect lung cancer cell lysates with high sensitivity down to 2 cells per microliter with silicon based photonic crystal microcavity sensors. Label free specificity is achieved via sandwiched assays and simultaneous multiplexed detection.
We have demonstrated electrically driven photonic crystal nanocavity lasers, LEDs and modulators with record low operation powers (e.g., lasing threshold of 180nA and sub-fJ/bit modulator operation), and with the modulation speeds exceeding 10GHz.
Single mode photonic crystal vertical cavity surface emitting lasers with a modulation bandwidth exceeding 13 GHz are achieved at current density as low as 3.7 kA/cm2 by separating the current and lasing apertures.
We describe our work on engineering nonlinear optical devices using quantum dots coupled to optical resonators. These systems enable large optical Stark shifts and all optical switching with low photon numbers.
Photonic crystals provide unprecedented control over light emission, absorption and propagation, which has led to the proposal of a large variety of optoelectronic devices. Three-dimensional devices with electronic functionality have however remained elusive, as fabrication of three-dimensional, electrically active nanostructured materials remains complex. Numerous techniques have been demonstrated...
Recently, the Fano resonance, known from atomic physics, has been employed for a wide variety of nanophotonic structures, such as quantum dots, photonic crystals (PCs), plasmonics, and metamaterials. [1, 2] With modal dispersion engineering, Fano filters and reflectors can all be realized in single-layer dielectric PC structures. [3–5] We report here ultra-compact surface-normal high-Q Fano resonance...
Terahertz (THz) waves (0.1–10 THz) have recently attracted much attention due to their new applications including spectroscopic sensing, nondestructive imaging and ultra-broadband wireless communications [1]. However, current THz-wave systems are cumbersome and expensive since they consist of bulky discrete components. To realize compact THz-wave systems, THz-wave integrated circuits (THz-wave ICs)...
We discuss our recent results on 2D and 3D photonic crystal (PhC) nanocavity lasers. By utilizing high quality InAs quantum dots (QDs), we demonstrated various types of 2D PhC nanocavity lasers including a single dot laser. The micromanipulation technique boosts the quality factor of 3D PhC nanocavity, which facilitated the first demonstration of lasing oscillation in 3D PhC nanocavity. A silicon-based...
CMOS-compatible III–V/Si vertical-cavity surface-emitting lasers (VCSELs) based on a double set of photonic crystal reflectors are demonstrated, showing single-mode continuous-wave operation at 1.55-µm with thresholds in the sub-mW range.
The creation of silicon based light sources has been a major research and development effort world-wide. Among various approaches to silicon based light sources reported thus far, the hybrid gain-medium approach (especially integrated with group III–V materials) seems to be the most promising one due to its higher efficiencies than any others. [1–3]
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.