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NorthRoad Photonics Corp. was founded in 2020, to commercialize several exciting technologies conceived at the University of Alberta. We are located in Edmonton, Alberta, Canada

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RT Series tunable filters

We're developing a new class of widely tunable bandpass optical filters, with octave-spanning operation in the visible, near-infrared (NIR), and mid-infrared (MIR).

RT Series tunable filters are a new class of wide-range-tunable bandpass filters based on frustrated total internal reflection (aka resonant optical tunneling). They can be customized for wavelength ranges in the visible (VIS), near-infrared (NIR), and mid-infrared (MIR), and used to filter both laser beams (e.g. super-continuum sources) and images (hyperspectral imaging).

They feature:

High optical density (>OD6 typical)
Wide-range out-of-band rejection (full tuning range +)
Up to octave-spanning tunable range
High polarization rejection (i.e. simultaneously functioning as a broadband polarizer)
Beam and image preservation

RTnirW1 - sample data and features

Octave-spanning tunability

oct — *Continuously tunable over the ~1200 - 2400 nm wavelength range*

High out-of-band-rejection

Adjustable passbands

Flat-top passbands

Out-of-band rejection

out — Rejection is increased for narrower passband settings

RT-Series - preliminary specifications

specs

References

T. R. Harrison et al., “A widely tunable bandpass filter based on resonant optical tunneling,” Opt. Express 27(16), 23633-23644 (2019).

T. R. Harrison et al., “Tunable bandpass imaging filter based on resonant tunneling through a ball lens assembly,” Appl. Opt. 59, 7037-7044 (2020).

J. Wallace, “Bandpass imaging filter in ball lens is simple and widely tunable: Based on frustrated total internal reflection, a tunable filter is compact, has a large range, and can be easily designed into optical systems.” LaserFocusWorld, 14181963, Nov. 2020.