Pentaband dichroics feature multiple notch-like reflection bands (e.g., 405/488/561/594/647nm) with high transmission between and beyond these bands. Design trade-offs include edge steepness, transmission efficiency in passbands (>90% typical), and suppression of excitation leakage (<OD6). Complex multi-band coatings are more expensive than single-band dichroics but eliminate mechanical switching.
Advanced Optics
Pentaband Dichroic
Multi-laser excitation without switching
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Definition
A dichroic mirror with five (or more) reflection/transmission bands, allowing simultaneous excitation with multiple laser lines without mechanical switching. Enables true multi-color imaging with no dichroic change overhead.
Technical Details
Simplified
A single special mirror that can reflect multiple laser colors while letting multiple fluorescence colors pass through. Instead of swapping mirrors for different colors (which takes time), one pentaband dichroic handles everything at once.
Why It Matters
With a pentaband dichroic and multi-camera detection, there's no mechanical switching between most channels. This eliminates the largest source of acquisition overhead, enabling 70%+ faster imaging for multi-channel Z-stacks.
Practical Example
The 405/488/561/594/647nm pentaband dichroic enables simultaneous 4-channel acquisition after sequential DAPI collection. For a 500-plane Z-stack, this reduces acquisition time from ~10 minutes (with filter wheel) to ~1 minute.