Second harmonic generation (SHG) from near infrared (IR) diode lasers is an attractive solution for blue-light sources with high peak power and narrow linewidth. IR sources based on broad stripe devices with narrow linewidth makes it possible to achieve a wide range of wavelengths throughout the blue region. This paper summarizes recent results utilizing a configuration of external dual grating reflector coupled surface emitting laser array for blue light generation.
Micro-Optics has expanded to include a wide variety of applications for spectral filtering, polarization filtering and beam
shaping. Recently, a new class of optical elements have been introduced that can combine the spectral, polarization, and
beam conditioning into the same optical element. This engineered optical functionality results in a 3D Meta-Optic
structure that relies on sub-wavelength features to essentially engineer the electromagnetic fields within the structure;
thereby, resulting in highly dispersive structures that spatially vary across the optical element. This talk will summarize
recent results in the design, fabrication and applications of 3D Meta-Optics.
Interference filters have a defect layer incorporated within a photonic crystal structure and generate a narrow transmission notch within a wide stop band. In this paper, we propose and demonstrate wavelength-tunable spatial filters by introducing diffractive optical elements in the defect layer. The spectral transmission through the device was a function of the local defect layer thickness under broadband illumination. For each wavelength, the spatial transmission followed the contours of equal defect layer optical thickness. The devices were implemented by depositing a one-dimensional photonic crystal with a centrally integrated defect layer on a silicon substrate using plasma-enhanced chemical vapor deposition. The defect layer was lithographically patterned with charge 2, 8-level vortex structures. The spectral transmission peak and linewidth was characterized by separately illuminating each zone of diffractive element using a tunable laser source and compared with model simulations. The spatial transmission through the device was imaged onto a CCD camera. Triangular wedge-shaped zones with wavelength-dependent orientations were observed. These novel devices with spectrally tunable spatial transmission have potential applications in pupil filtering, hyperspectral imaging, and engineered illumination systems.
Interference transmission filters that have a defect layer incorporated photonic crystal structure provide a narrow
transmission notch within a wide stop band. The location and width of transmission notch can be tuned by changing the
thickness of the defect layer. In this paper, we propose and implement interference filters with defect layers patterned
with diffractive optical elements. The spectral transmission is a function of the local defect layer thickness while the
spatial transmission follows contours of equal optical thickness. The novel devices have multiplexed spectral and spatial
transmission characteristics. Alternating layers of silicon oxide (SiOx) and silicon nitride (SixNy) were grown onto a
clean silicon substrate using plasma enhanced chemical vapor deposition (PECVD). A thick defect layer of SiOx was
grown and the wafer was removed from the growth chamber. The wafer was then patterned with charge 2, 8-level
vortex structures on a GCA 6300 g-line stepper tool. The devices were interrogated with a collimated beam from a
tunable laser source that operates from 1520 nm to 1630 nm. The spectral transmission was measured by separately
illuminating each level of diffractive element and the spatial transmission was imaged on to a CCD camera. Spectral
transmission peaks whose location varies as a function of level height were obtained. The spatial transmission profiles
consist of triangular zones with wavelength dependent orientation. The elements have potential applications in hyper
spectral imaging, pupil filtering, and engineered illumination systems.
Recent achievements in second harmonic generation (SHG) from mid-IR diode lasers have made the realization of
compact blue-light sources with high power a reality. Moreover, narrow linewidth control of IR sources based on broad
stripe high power devices makes it possible to achieve a wide range of wavelengths throughout the blue region. This
paper summarizes recent results utilizing a novel Master Oscillator Power Amplifier configuration for blue light
Semiconductor microspheres coupled to optical fibers are used for optical channel dropping in the IR communication wavelenghts of 800 to 1500 nm. The observed morphology dependent resonances have quality factors of 100000. The measured quality factors are limited by the sensitivity of the experimental setup. These optical resonances provide the necessary narrow linewidths, that are needed for high resolution optical communication applications. In addition to optical communication, detection, and switching applications of this optoelectronic system is studied experimentally and theoretically. The microsphere, optical fiber system shows promise as a building block for optoelectronic integration.
Dielectric and semiconductor microspheres coupled to optical fibers are used for optical channel dropping in the infrared communication wavelengths of 810 and 1300 nm. Additionally, a dielectric microsphere coupled to an optical fiber and placed in close proximity to a silicon photodiode is used for resonant detection of communication signals at 810 nm. The observed resonances have quality factors of 100.000. The measured quality factors are limited by the
sensitivity of the measurement setup. These optical resonances provide the necessary narrow linewidths that are needed for high resolution optical communication applications. The microsphere, optical fiber, and detector system shows promise as a building block for optoelectronic integration.