QuantaOptic™ 222nm bandpass filters

A QuantaOptic™ band–pass filter or bandpass filter (BPF) is a device that passes wavelengths within a certain range and rejects (attenuates) wavelengths outside that range.



Far-UVC 222nm 220nm 210nm Bandpass Light Filter For AP-UVGI Lamp and Bulb Applications

Active Personnel UVGI (Ultraviolet Germicidal Irradiation)

Why do you need a QuantaOptic™ bandpass filter for 222nm Far UVC excimer lamps and Far UV bulbs?

Ultraviolet (UVC) light has been used effectively for line-of-sight sterilization of rooms, objects, and skin for over a century. Still, these higher energy photons can also cause severe sunburn and skin cancer. Fortunately, Far-UV light at peak wavelengths at 222nm for Far-UV Bulbs/Lamps or Far-UVC at 219nm from new nano-tech LEDs is capable of sterilization without harming human skin or eyes, making it a safe and effective technology to combat bio-agent threats in the air in real-time with Active Personnel inside the decontamination zone.  QuantaOptic™ Optical filters can be designed to transmit the desired UVC frequency while blocking the harmful wavelengths for compliance with AP-UVGI safety protocols

The electromagnetic spectrum’s UV section is between x-rays and visible light, from 100nm to 400nm. British researchers Arthur Downes and Thomas Blunt discovered the sterilization properties of UVC light in 1878. Danish doctor Niels Finsen won the 1903 Nobel Prize in Medicine for employing UV light in the treatment of skin disease.

When living organisms absorb high-energy photons in the 100nm to 315nm range, they partially destroy the cellular DNA and RNA. A cell having damaged or destroyed genetic material cannot function; they lose their reproductive capacity and eventually die. Consequently, UVC light is considered to be an extremely effective method of killing bacteria and viruses. Several studies have determined that the UVC range of 200nm to 280nm is most effective for sterilization. They have also concluded that UV irradiation causes damage to human skin.

Research has shown that emissions at 222nm from an excimer lamp can provide sterilization without penetrating the skin’s basal layer. To prevent harm to people in the area of disinfection, the emission spectrum needs to be filtered to suppress the damaging longer wavelengths capable of dermal penetration. This can be achieved using a suitably designed QuantaOptic Far UV bandpass filter.

Our QuantaOptic Far-UV bandpass filters are capable of 60% transmission at 222nm and block longer wavelengths up to 280nm. Our QuantaOptic filters (210nm 220nm 222nm far UVC bandpass filter narrowband optical filter) can be supplied in custom sizes for integration into various lamp configurations.

Active Personnel UVGI: Below spectrogram of 222nm excimer light with filter and without a QuantaOptic Far-UV bandpass filter.


A filter is needed (210nm 220nm 222nm far UVC bandpass filter narrowband optical filter) for the 222nm far UVC excimer lamps to make them as safe as possible for human exposure.