In general, typical filter optical specifications will include the wavelength ranges over which to reflect and transmit light, angle of incidence tuning range, clear aperture of the filter, the polarization state of light for non-normal angles of incidence, light coherency (laser or white light), optical beam size and cone angle of light, desired substrate material (with dimensions), incident light medium (air or glass) and so forth.
This article answers an array of frequently asked questions about optical thin film filters. It provides in-depth information on what they are, how they are created, how they perform, and what to look for when selecting an optical thin film filter supplier.
Researchers at Brown University have demonstrated a new method of modulating the coherence of light by using surface plasmon polaritons in metal films. This technique represents an alternative way to engineer flat optical elements that could be applied in optical communication, beam shaping, and microscopic imaging.
Researchers at TU Wien (Vienna) have developed a type of cloaking technology that renders opaque materials invisible by letting the flow of light pass through the medium unperturbed.
Researchers at Brown University and Osaka University have developed a technique to polarize light for terahertz waves using a new type of beamsplitter made from stacks of spaced metal plates.
A new type of 3D display being developed by researchers at the University of Illinois at Urbana-Champaign could pave the way for augmented reality (AR) and virtual reality (VR) headsets that do not cause headaches, nausea and eye fatigue symptoms commonly reported by users.
Since the excitation source laser intensity is often six to eight orders of magnitude greater than the Raman scattered signal, edge pass filters are required to block the wavelength of the scattered laser beam while transmitting the wavelength shifted Raman scattered signal.
PIXELTEQ micro-patterned optical coatings combine patented microlithography expertise with state-of-the-art coating technology. These micro-patterned filters help create compact and cost-effective optical devices for use in biomedical, security and defense, aerospace, precision agriculture and machine vision applications.
Continued improvements in multilayer thin film filter (TFF) design and manufacturing methods — such as in-situ optical monitoring and automated coater control with dynamic design adjustment — have enabled successful production of optical filters with increasing control over the spectral shape.
Most Raman microscopy applications seek to maximize access to the Raman fingerprint of the molecule of interest, requiring filters that provide “more signal with less background.” This article discusses optical filters for Raman analysis, addressing filters for both bench-top and portable Raman applications.
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