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Chapter 6:
Maximum Potential Transmittance for Induced-Transmission Filters
Bandpass filters can be constructed using only dielectric materials for the thinfilm structures and substrates. These structures are used to create bandpass regions; the long- and short-wavelength-blocking structures suppress the light leaks on either side of the bandpass region. Alternatively, the bandpass region, or spike structure, can be formed using a metal layer in combination with the dielectric layers. As the bandpass filter is being designed to work in transmission, the metal layer must be thin enough to transmit the wavelength of interest. Such filters are known as induced-transmission filters and have the added advantage of improved long-wavelength offband suppression.
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