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In this work we present a methodology to post-process a large array of a few hundred nanometer thin photonic membranes that were fabricated using complementary metal-oxide-semiconductor (CMOS) technological platform. The post processing results in local removal of the silicon substrate and of the buried oxide (BOX), which provides a free access from both side of the photonic structures. The membranes...
We exploit the resonant enhancement of light in photonic crystal slabs to enhance selected optical properties. Enhancement of absorption and local field gradients result in applications to microscale heating and optical trapping, respectively.
We used a 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST) crystal coupled with a Si prism to detect THz pulsed radiation in heterodyne electro-optic sampling scheme. The detection efficiency is higher than that for a DAST crystal without a prism, as well as for a LiNbO3 crystal with a Si prism.
We report free-space coupled single-layer and coupled bi-layer silicon photonic crystal refractive index sensing schemes to simultaneously achieve extremely high quality factor Q > 107 and high sensitivity S of 800–900 nm/RIU, with corresponding theoretical detection limit around 10−8 RIU. Experimentally demonstrated detection limit of 10−6 RIU was achieved.
A 2D integrating cell waveguide platform is presented where ultra-long optical path lengths in a small area are realized by multiple reflections of a guided signal at PhC boundaries. In experiments, path lengths of 25 cm are demonstrated in integrating cells with 1.8 mm radius.
We report on the integration of carbon nanotubes in silicon micro-cavities to develop cost-effective light sources. Strong light coupling from carbon nanotubes was demonstrated into silicon photonics resonators, nanobeam cavities and photonic crystals.
We present the design and fabrication of surface normal photonic crystal high Q Si3N4 filter on quartz and high performance SÌ3N4 suspended reflectors at near infrared. We report a Si3N4 filter on quartz with a quality factor of over 27000. We also report a 99% peak reflection from fabricated Si3N4 reflectors with reflection band of 20 nm.
In this paper, a two-dimensional photonic crystal based tunable optical filter having Si rods with different shape cavities, as H-shape, square and circular is designed and investigated. The shape of Si rods is also changed from circular to square and the shift in resonating frequency of filter is achieved. The area of each cavity has been kept constant for achieving the result. The filter is designed...
We present recent progress achieved with III-nitride photonic circuits epitaxially grown on silicon(111). The photonic circuits embed two-dimensional photonic crystals and microdisk resonators coupled to suspended waveguides. We discuss the linear and nonlinear response of the resonators through second and third harmonic generation.
We report here photonic crystal surface emitting lasers on bulk silicon substrates. Optically pumped lasers were demonstrated with single mode operation. Thermal resistance of such oxide-free cavity was investigated to evaluate the heat dissipation and lasing characteristics.
We report on the realization of high-Q/V silicon photonic crystal cavities with resonance wavelengths in the telecom window around 1.55 µm. The cavity designs are based on an effective Aubry-Andrè-Harper bichromatic potential, defined by the superposition of two one-dimensional lattices with an incommensurate ratio between their periodicity constants. This peculiar confinement mechanism allows to...
In nanofabrication, it is a major challenge to characterize the structure of a real sample, in particular of three-dimensional (3D) ones that control non-linear optics or quantum dot emission [1]. The challenge notably pertains to nanophotonic media whose properties are determined by their complex structure with feature sizes d comparable to or even less than the wavelength of light (d<2). These...
Light propagates inside an ideal and infinite photonic crystal when the Bloch condition is satisfied and any allowed light wave is decomposed in a basis of propagating Bloch waves [1]. In real photonic crystals, light propagation is modified due to unavoidable fabrication-induced structural imperfections in size, positions, and permittivity of the building blocks, as well as the finite size of the...
The recently introduced concept of photonic phase diagram between metamaterials and photonic crystals allows the design of periodic dielectric structures to be easier. In this paper, we apply inverse dispersion method to build the phase diagram of structures with a frequency dependent dielectric permittivity of their constituents. We show that the phase diagram obtained by means of the inverse dispersion...
Biosensor is an analytical device used to detect the biological analyte, which can be antibodies enzymes cells or biomolecules. Biosensors have many applications like in environmental monitoring, biomedical research, and healthcare. In this paper we have proposed a nano-cavity coupled waveguide 2D photonic crystal biosensor which can be able to detect different blood components. This structure has...
In this work we present the first steps towards achieving Photonic Crystals (PCs) operating in the Near-Infrared (NIR) wavelength range using Macroporous Silicon (MPS). The MPS structures herein shown are fabricated using Electrochemical Etching (EE) of silicon. Pores are arranged in a square lattice of 500 nm periodicity and pore size is around 200 nm to 350 nm. Preliminary results show straight...
In this study we compare the optical response of macroporous silicon photonic crystals with several cavities inside their structure respect to the obtained in the single cavity case. We show that there are as much raising peaks in the transmission spectrum as number of cavities are inserted in the middle of the structure. Even more, this study reports the enhancement in the peaks' features -e.g. base...
We first propose a two-dimensional photonic crystal platform for optomechanically modulating the spontaneous emission. The platform consists of two slotted photonic crystal cavities for optomechanical pumping and emission enhancement respectively, where there is a shared barrier oscillator to bridge the optomechanical dynamics of these two cavities.
Photonic crystal (PhC) nanobeam cavities have attracted increasing attention owing to the advantages of high Q-factor, small mode volume and no limitation of FSR. Various PhC cavities have been developed for optical communications, optical sensors, optomechanics, etc.. We investigate the design, fabrication, and experimental characterization of high quality factor PhCnanobeam cavities on silicon....
CMOS compatible lasers on silicon (Si) remain to be an active and challenging area of research for integrated Si photonics. Over the last few years, we have been working on heterogeneous integration of III–V/Si material systems for the development of various photonic crystal membrane lasers on silicon. Earlier we proposed and demonstrated a membrane reflector surface-emitting laser on silicon, based...
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